diff --git a/README.md b/README.md
index c2d2355..ed9cda7 100644
--- a/README.md
+++ b/README.md
@@ -38,7 +38,7 @@ flutter run -d macos
 
 Will be published as `fai/studio` on Forgejo (`git.flemming.ws`).
 The local directory `chain_studio/` follows the established
-`fai_platform/` layout convention.
+`fai_chain/` layout convention.
 
 ## Why "Studio" and not "Stage"
 
diff --git a/assets/docs/federation.md b/assets/docs/federation.md
index 475cdf6..71d02b2 100644
--- a/assets/docs/federation.md
+++ b/assets/docs/federation.md
@@ -14,7 +14,7 @@ connected and lets you enrol new ones.
 2. The hub issues a single-use **bootstrap token** and bundles its
    **CA certificate**. Copy the shown config into the satellite's
    `config.yaml` (one paste) and export the token as
-   `FAI_BOOTSTRAP_TOKEN`.
+   `CHAIN_BOOTSTRAP_TOKEN`.
 3. Start the satellite. It dials the primary, the CA pin makes the
    first connect tamper-proof, and the primary signs it a short-lived
    certificate. It then appears in this list.
diff --git a/assets/docs/federation_de.md b/assets/docs/federation_de.md
index b3f9628..ef8b295 100644
--- a/assets/docs/federation_de.md
+++ b/assets/docs/federation_de.md
@@ -16,7 +16,7 @@ verbundenen Satelliten und richtet neue ein.
 2. Der Hub stellt ein einmaliges **Bootstrap-Token** aus und legt sein
    **CA-Zertifikat** bei. Kopiere die gezeigte Konfiguration in die
    `config.yaml` des Satelliten (ein Einfügen) und exportiere das
-   Token als `FAI_BOOTSTRAP_TOKEN`.
+   Token als `CHAIN_BOOTSTRAP_TOKEN`.
 3. Starte den Satelliten. Er wählt sich beim Primary ein, der CA-Pin
    macht den ersten Connect manipulationssicher, und der Primary
    signiert ihm ein kurzlebiges Zertifikat. Danach erscheint er in
diff --git a/docs/landing-page-design.md b/docs/landing-page-design.md
index 73df811..d80063f 100644
--- a/docs/landing-page-design.md
+++ b/docs/landing-page-design.md
@@ -102,7 +102,7 @@ Instead a `_DocReaderSheet` (modal bottom-sheet, same shape as
 existing `flutter_markdown` package — same one the Store uses
 for module READMEs. The doc source is bundled with Studio as
 `assets/docs/*.md`, kept in sync via a build step that copies
-the relevant files from `fai_platform/docs/`.
+the relevant files from `fai_chain/docs/`.
 
 Pros:
 - Air-gap-tauglich (no network call to read docs)
@@ -158,7 +158,7 @@ phased PRs:
    content with hard-coded strings (with i18n). Lands
    without the embedded-doc reader.
 2. **Phase B** — bundled markdown docs + `_DocReaderSheet`.
-   Pick 4-5 source docs from `fai_platform/docs/architecture/`
+   Pick 4-5 source docs from `fai_chain/docs/architecture/`
    that map to operator concerns (security, host-services,
    flow-experience, compliance-gaps). Add a build script that
    syncs them into `assets/docs/`.
diff --git a/lib/data/fai_log.dart b/lib/data/chain_log.dart
similarity index 98%
rename from lib/data/fai_log.dart
rename to lib/data/chain_log.dart
index 6e87647..440f23a 100644
--- a/lib/data/fai_log.dart
+++ b/lib/data/chain_log.dart
@@ -26,10 +26,10 @@ import 'dart:io';
 import 'package:meta/meta.dart';
 import 'package:path/path.dart' as p;
 
-class FaiLog {
-  FaiLog._();
+class ChainLog {
+  ChainLog._();
 
-  static final FaiLog instance = FaiLog._();
+  static final ChainLog instance = ChainLog._();
 
   // Serialise concurrent writes — Future-based mutex so a burst
   // of errors (rare but happens during failed install retries)
diff --git a/lib/data/error_presentation.dart b/lib/data/error_presentation.dart
index 8c815ec..27ee75a 100644
--- a/lib/data/error_presentation.dart
+++ b/lib/data/error_presentation.dart
@@ -16,9 +16,9 @@
 
 import 'package:flutter/material.dart';
 
-import '../widgets/fai_error_box.dart';
+import '../widgets/chain_error_box.dart';
 import '../theme/tokens.dart';
-import 'fai_log.dart';
+import 'chain_log.dart';
 
 /// Show [error] as a SnackBar with a copy affordance.
 ///
@@ -41,7 +41,7 @@ void showFaiErrorSnack(
 }) {
   // Fire-and-forget log write. If the disk's full or the dir
   // is read-only the UI still surfaces the error.
-  FaiLog.instance.error(source, error, context: title);
+  ChainLog.instance.error(source, error, context: title);
   final messenger = ScaffoldMessenger.maybeOf(context);
   if (messenger == null) {
     // No Scaffold above — the caller is likely showing the
@@ -60,8 +60,8 @@ void showFaiErrorSnack(
       padding: EdgeInsets.zero,
       content: Padding(
         padding: const EdgeInsets.symmetric(
-          horizontal: FaiSpace.sm,
-          vertical: FaiSpace.xs,
+          horizontal: ChainSpace.sm,
+          vertical: ChainSpace.xs,
         ),
         child: Column(
           mainAxisSize: MainAxisSize.min,
@@ -75,9 +75,9 @@ void showFaiErrorSnack(
                   fontWeight: FontWeight.w600,
                 ),
               ),
-              const SizedBox(height: FaiSpace.xs),
+              const SizedBox(height: ChainSpace.xs),
             ],
-            FaiErrorBox(error: error, isError: true),
+            ChainErrorBox(error: error, isError: true),
           ],
         ),
       ),
@@ -94,14 +94,14 @@ Future<void> showFaiErrorDialog(
   Object error, {
   String? title,
 }) async {
-  FaiLog.instance.error(source, error);
+  ChainLog.instance.error(source, error);
   return showDialog<void>(
     context: context,
     builder: (ctx) => AlertDialog(
       title: title == null ? null : Text(title),
       content: SizedBox(
         width: 480,
-        child: FaiErrorBox(error: error, isError: true, maxHeight: 240),
+        child: ChainErrorBox(error: error, isError: true, maxHeight: 240),
       ),
       actions: [
         TextButton(
diff --git a/lib/data/flow_run_driver.dart b/lib/data/flow_run_driver.dart
index 1864f15..43e8c32 100644
--- a/lib/data/flow_run_driver.dart
+++ b/lib/data/flow_run_driver.dart
@@ -161,7 +161,7 @@ class StudioFlowRunDriver implements editor.FlowRunDriver {
   /// (text / json / bytes only). File outputs degrade to
   /// JSON containing the URI string — the editor's run-tab
   /// renderer is read-only so the operator can still see
-  /// where the file went; Studio's richer FaiFlowOutput
+  /// where the file went; Studio's richer ChainFlowOutput
   /// widget keeps file-open affordances available elsewhere.
   editor.FlowOutputValue _convertOutput(FlowOutput out) {
     return switch (out) {
diff --git a/lib/data/hub.dart b/lib/data/hub.dart
index da95297..559dcaf 100644
--- a/lib/data/hub.dart
+++ b/lib/data/hub.dart
@@ -1,4 +1,4 @@
-// HubService — singleton wrapper around fai_dart_sdk's HubClient.
+// HubService — singleton wrapper around chain_dart_sdk's HubClient.
 //
 // Centralises the gRPC connection so each page just imports
 // `HubService.instance` instead of constructing its own client.
@@ -1282,7 +1282,7 @@ class SatelliteEnrollment {
     return 'federation:\n'
         '  upstream: https://<this-primary-host>:<federation-port>\n'
         '  hub_name: $name\n'
-        '  bootstrap_token_env: FAI_BOOTSTRAP_TOKEN$ca';
+        '  bootstrap_token_env: CHAIN_BOOTSTRAP_TOKEN$ca';
   }
 }
 
@@ -1553,7 +1553,7 @@ class HardwareSnapshot {
 }
 
 /// One curated model with editorial metadata. Wire-faithful
-/// with `crates/fai_hub/system-ai/models.yaml`.
+/// with `crates/chain_hub/system-ai/models.yaml`.
 class CuratedModelInfo {
   final String id;
   final String family;
diff --git a/lib/data/registry_token.dart b/lib/data/registry_token.dart
index dde1799..820b9c8 100644
--- a/lib/data/registry_token.dart
+++ b/lib/data/registry_token.dart
@@ -4,7 +4,7 @@ import 'package:path/path.dart' as p;
 /// Operator-managed registry auth token, kept at
 /// `~/.chain/registry-token` (mode 0600 on Unix). The hub reads
 /// this file at install time when `CHAIN_REGISTRY_TOKEN` is unset
-/// — see `download_to_temp` in `crates/fai_hub/src/lib.rs`.
+/// — see `download_to_temp` in `crates/chain_hub/src/lib.rs`.
 ///
 /// Studio writes the file directly so a fresh install never
 /// requires the operator to fiddle with shell env vars.
diff --git a/lib/data/system_actions.dart b/lib/data/system_actions.dart
index 6ef7822..6cd8149 100644
--- a/lib/data/system_actions.dart
+++ b/lib/data/system_actions.dart
@@ -22,7 +22,7 @@ import 'package:shared_preferences/shared_preferences.dart';
 
 /// Sentinel returned in `_runFai(...).stderr` when no `fai`
 /// binary could be located. UI layers should not display this
-/// verbatim — they check [SystemActions.faiBinaryExists] first
+/// verbatim — they check [SystemActions.chainBinaryExists] first
 /// and render a localized, actionable message instead.
 const String kFaiBinaryNotFound = 'fai-binary-not-found';
 
@@ -37,7 +37,7 @@ class SystemActions {
 
   /// SharedPreferences key for an operator-chosen `fai` binary
   /// path (set via the file picker when auto-detection fails).
-  static const String _kFaiBinaryPrefKey = 'system.fai_binary_path';
+  static const String _kFaiBinaryPrefKey = 'system.chain_binary_path';
 
   /// In-memory cache of the operator override, loaded once at
   /// startup by [loadFaiBinaryOverride]. Null = no override.
@@ -71,7 +71,7 @@ class SystemActions {
   /// the canonical install dir). UI uses this to decide between
   /// the normal daemon-control affordances and the "locate the
   /// binary / read the install guide" recovery path.
-  static bool faiBinaryExists() => _faiExecutable() != null;
+  static bool chainBinaryExists() => _faiExecutable() != null;
 
   /// Ask the OS to open [path] in the default handler. On macOS
   /// this opens text files in TextEdit, configs in the registered
@@ -137,7 +137,7 @@ class SystemActions {
 
   /// Run a `chain daemon ...` subcommand and surface the captured
   /// output. Used by Doctor's "Restart daemon" button.
-  static Future<({bool ok, String stdout, String stderr})> faiDaemon(
+  static Future<({bool ok, String stdout, String stderr})> chainDaemon(
     List<String> args,
   ) async {
     return _runFai(['daemon', ...args]);
@@ -145,7 +145,7 @@ class SystemActions {
 
   /// Run `chain update apply --channel <c>`. Long-running on a slow
   /// network — caller should show a spinner.
-  static Future<({bool ok, String stdout, String stderr})> faiUpdateApply(
+  static Future<({bool ok, String stdout, String stderr})> chainUpdateApply(
     String channel,
   ) async {
     return _runFai(['update', 'apply', '--channel', channel]);
@@ -154,7 +154,7 @@ class SystemActions {
   /// Switch the active channel pointer at `~/.chain/current-channel`.
   /// The CLI also restarts the daemon for the new channel, so the
   /// caller does not need a follow-up restart.
-  static Future<({bool ok, String stdout, String stderr})> faiChannelSwitch(
+  static Future<({bool ok, String stdout, String stderr})> chainChannelSwitch(
     String channel,
   ) async {
     return _runFai(['channel', 'switch', channel]);
@@ -164,14 +164,14 @@ class SystemActions {
   /// (launchd plist on macOS, systemd-user unit on Linux). On
   /// Windows the platform CLI returns a "not supported" exit
   /// status that the caller surfaces as an error message.
-  static Future<({bool ok, String stdout, String stderr})> faiDaemonEnable(
+  static Future<({bool ok, String stdout, String stderr})> chainDaemonEnable(
     String channel,
   ) async {
     return _runFai(['daemon', 'enable', '--channel', channel]);
   }
 
-  /// Remove the autostart unit installed by [faiDaemonEnable].
-  static Future<({bool ok, String stdout, String stderr})> faiDaemonDisable(
+  /// Remove the autostart unit installed by [chainDaemonEnable].
+  static Future<({bool ok, String stdout, String stderr})> chainDaemonDisable(
     String channel,
   ) async {
     return _runFai(['daemon', 'disable', '--channel', channel]);
@@ -186,7 +186,7 @@ class SystemActions {
   ///
   /// Studio's gRPC channel goes down for ~1s while the daemon
   /// restarts — caller should follow up with a reconnect.
-  static Future<({bool ok, String stdout, String stderr})> faiReset({
+  static Future<({bool ok, String stdout, String stderr})> chainReset({
     bool keepModules = false,
     bool keepData = false,
   }) async {
@@ -202,9 +202,9 @@ class SystemActions {
     final exe = _faiExecutable();
     if (exe == null) {
       // Sentinel, not a user-facing string. Callers detect this
-      // via `faiBinaryExists()` and render a localized,
+      // via `chainBinaryExists()` and render a localized,
       // actionable recovery message (locate binary / install
-      // guide) instead of CLI jargon like "set FAI_BIN".
+      // guide) instead of CLI jargon like "set CHAIN_BIN".
       return (ok: false, stdout: '', stderr: kFaiBinaryNotFound);
     }
     try {
@@ -226,7 +226,7 @@ class SystemActions {
   }
 
   /// Locate the `fai` binary. Order: operator override (set via
-  /// the file picker), $FAI_BIN, PATH, fallback to the canonical
+  /// the file picker), $CHAIN_BIN, PATH, fallback to the canonical
   /// install location under the user's home dir.
   static String? _faiExecutable() {
     final override = _faiBinaryOverride;
@@ -236,7 +236,7 @@ class SystemActions {
       return override;
     }
 
-    final fromEnv = Platform.environment['FAI_BIN'];
+    final fromEnv = Platform.environment['CHAIN_BIN'];
     if (fromEnv != null && fromEnv.isNotEmpty && File(fromEnv).existsSync()) {
       return fromEnv;
     }
diff --git a/lib/data/theme_plugin.dart b/lib/data/theme_plugin.dart
index 701ce31..03f1770 100644
--- a/lib/data/theme_plugin.dart
+++ b/lib/data/theme_plugin.dart
@@ -16,7 +16,7 @@ import 'hub.dart';
 
 /// SharedPreferences key for the operator's preferred theme
 /// plugin. `null` (or absent) means "use Studio's built-in
-/// default" (FaiTheme.light / .dark).
+/// default" (ChainTheme.light / .dark).
 const _kThemePluginKey = 'theme_plugin_capability';
 
 /// One ColorScheme pair as built from a theme-plugin's
@@ -96,14 +96,14 @@ Future<ThemePluginSchemes> loadThemePluginSchemes(String capability) async {
 }
 
 /// Build a `ThemeData` from a plugin-supplied `ColorScheme`.
-/// Delegates to [FaiTheme.fromColorScheme] so plugin-themed
+/// Delegates to [ChainTheme.fromColorScheme] so plugin-themed
 /// builds and built-in themes share one structural shape — same
 /// textTheme cascade, same component themes, same `inherit`
 /// values on every TextStyle. Without that, Flutter's
 /// AnimatedDefaultTextStyle lerp blows up when swapping between
 /// the two paths.
 ThemeData themeDataFromScheme(ColorScheme scheme) =>
-    FaiTheme.fromColorScheme(scheme);
+    ChainTheme.fromColorScheme(scheme);
 
 /// Translate the plugin's 14 ARGB tokens into a `ColorScheme`.
 /// Order matches the plugin contract:
diff --git a/lib/l10n/app_de.arb b/lib/l10n/app_de.arb
index f38d7fc..e0e3ef2 100644
--- a/lib/l10n/app_de.arb
+++ b/lib/l10n/app_de.arb
@@ -1539,13 +1539,13 @@
       "detail": {"type": "String"}
     }
   },
-  "faiBinaryNotFound": "Das Programm `fai` wurde auf diesem Rechner nicht gefunden.",
-  "faiBinaryNotFoundHint": "Installiere die Ch∆In-Plattform oder verweise Studio auf eine vorhandene `fai`-Datei.",
-  "faiBinaryLocateButton": "`fai`-Programm suchen …",
-  "faiBinaryInstallDocsButton": "Installationsanleitung öffnen",
-  "faiBinaryPickerTitle": "`fai`-Programm auswählen",
-  "faiBinarySetOk": "Verwende `fai` unter {path}",
-  "@faiBinarySetOk": {
+  "chainBinaryNotFound": "Das Programm `chain` wurde auf diesem Rechner nicht gefunden.",
+  "chainBinaryNotFoundHint": "Installiere die Ch∆In-Plattform oder verweise Studio auf eine vorhandene `chain`-Datei.",
+  "chainBinaryLocateButton": "`chain`-Programm suchen …",
+  "chainBinaryInstallDocsButton": "Installationsanleitung öffnen",
+  "chainBinaryPickerTitle": "`chain`-Programm auswählen",
+  "chainBinarySetOk": "Verwende `chain` unter {path}",
+  "@chainBinarySetOk": {
     "placeholders": {
       "path": {"type": "String"}
     }
diff --git a/lib/l10n/app_en.arb b/lib/l10n/app_en.arb
index 7b02d9e..90fbe3f 100644
--- a/lib/l10n/app_en.arb
+++ b/lib/l10n/app_en.arb
@@ -1542,13 +1542,13 @@
       "detail": {"type": "String"}
     }
   },
-  "faiBinaryNotFound": "Could not find the `fai` program on this machine.",
-  "faiBinaryNotFoundHint": "Install the Ch∆In platform, or point Studio at an existing `fai` binary.",
-  "faiBinaryLocateButton": "Locate `fai` binary…",
-  "faiBinaryInstallDocsButton": "Open install guide",
-  "faiBinaryPickerTitle": "Select the `fai` binary",
-  "faiBinarySetOk": "Using `fai` binary at {path}",
-  "@faiBinarySetOk": {
+  "chainBinaryNotFound": "Could not find the `chain` program on this machine.",
+  "chainBinaryNotFoundHint": "Install the Ch∆In platform, or point Studio at an existing `chain` binary.",
+  "chainBinaryLocateButton": "Locate `chain` binary…",
+  "chainBinaryInstallDocsButton": "Open install guide",
+  "chainBinaryPickerTitle": "Select the `chain` binary",
+  "chainBinarySetOk": "Using `chain` binary at {path}",
+  "@chainBinarySetOk": {
     "placeholders": {
       "path": {"type": "String"}
     }
diff --git a/lib/l10n/app_localizations.dart b/lib/l10n/app_localizations.dart
index d994ad6..2913867 100644
--- a/lib/l10n/app_localizations.dart
+++ b/lib/l10n/app_localizations.dart
@@ -4328,41 +4328,41 @@ abstract class AppLocalizations {
   /// **'Could not start daemon: {detail}'**
   String daemonStartFailed(String detail);
 
-  /// No description provided for @faiBinaryNotFound.
+  /// No description provided for @chainBinaryNotFound.
   ///
   /// In en, this message translates to:
-  /// **'Could not find the `fai` program on this machine.'**
-  String get faiBinaryNotFound;
+  /// **'Could not find the `chain` program on this machine.'**
+  String get chainBinaryNotFound;
 
-  /// No description provided for @faiBinaryNotFoundHint.
+  /// No description provided for @chainBinaryNotFoundHint.
   ///
   /// In en, this message translates to:
-  /// **'Install the Ch∆In platform, or point Studio at an existing `fai` binary.'**
-  String get faiBinaryNotFoundHint;
+  /// **'Install the Ch∆In platform, or point Studio at an existing `chain` binary.'**
+  String get chainBinaryNotFoundHint;
 
-  /// No description provided for @faiBinaryLocateButton.
+  /// No description provided for @chainBinaryLocateButton.
   ///
   /// In en, this message translates to:
-  /// **'Locate `fai` binary…'**
-  String get faiBinaryLocateButton;
+  /// **'Locate `chain` binary…'**
+  String get chainBinaryLocateButton;
 
-  /// No description provided for @faiBinaryInstallDocsButton.
+  /// No description provided for @chainBinaryInstallDocsButton.
   ///
   /// In en, this message translates to:
   /// **'Open install guide'**
-  String get faiBinaryInstallDocsButton;
+  String get chainBinaryInstallDocsButton;
 
-  /// No description provided for @faiBinaryPickerTitle.
+  /// No description provided for @chainBinaryPickerTitle.
   ///
   /// In en, this message translates to:
-  /// **'Select the `fai` binary'**
-  String get faiBinaryPickerTitle;
+  /// **'Select the `chain` binary'**
+  String get chainBinaryPickerTitle;
 
-  /// No description provided for @faiBinarySetOk.
+  /// No description provided for @chainBinarySetOk.
   ///
   /// In en, this message translates to:
-  /// **'Using `fai` binary at {path}'**
-  String faiBinarySetOk(String path);
+  /// **'Using `chain` binary at {path}'**
+  String chainBinarySetOk(String path);
 
   /// No description provided for @sysAiFixParse.
   ///
diff --git a/lib/l10n/app_localizations_de.dart b/lib/l10n/app_localizations_de.dart
index 7e8df68..9b0a336 100644
--- a/lib/l10n/app_localizations_de.dart
+++ b/lib/l10n/app_localizations_de.dart
@@ -2535,25 +2535,25 @@ class AppLocalizationsDe extends AppLocalizations {
   }
 
   @override
-  String get faiBinaryNotFound =>
-      'Das Programm `fai` wurde auf diesem Rechner nicht gefunden.';
+  String get chainBinaryNotFound =>
+      'Das Programm `chain` wurde auf diesem Rechner nicht gefunden.';
 
   @override
-  String get faiBinaryNotFoundHint =>
-      'Installiere die Ch∆In-Plattform oder verweise Studio auf eine vorhandene `fai`-Datei.';
+  String get chainBinaryNotFoundHint =>
+      'Installiere die Ch∆In-Plattform oder verweise Studio auf eine vorhandene `chain`-Datei.';
 
   @override
-  String get faiBinaryLocateButton => '`fai`-Programm suchen …';
+  String get chainBinaryLocateButton => '`chain`-Programm suchen …';
 
   @override
-  String get faiBinaryInstallDocsButton => 'Installationsanleitung öffnen';
+  String get chainBinaryInstallDocsButton => 'Installationsanleitung öffnen';
 
   @override
-  String get faiBinaryPickerTitle => '`fai`-Programm auswählen';
+  String get chainBinaryPickerTitle => '`chain`-Programm auswählen';
 
   @override
-  String faiBinarySetOk(String path) {
-    return 'Verwende `fai` unter $path';
+  String chainBinarySetOk(String path) {
+    return 'Verwende `chain` unter $path';
   }
 
   @override
diff --git a/lib/l10n/app_localizations_en.dart b/lib/l10n/app_localizations_en.dart
index aa3c396..c6dc667 100644
--- a/lib/l10n/app_localizations_en.dart
+++ b/lib/l10n/app_localizations_en.dart
@@ -2538,25 +2538,25 @@ class AppLocalizationsEn extends AppLocalizations {
   }
 
   @override
-  String get faiBinaryNotFound =>
-      'Could not find the `fai` program on this machine.';
+  String get chainBinaryNotFound =>
+      'Could not find the `chain` program on this machine.';
 
   @override
-  String get faiBinaryNotFoundHint =>
-      'Install the Ch∆In platform, or point Studio at an existing `fai` binary.';
+  String get chainBinaryNotFoundHint =>
+      'Install the Ch∆In platform, or point Studio at an existing `chain` binary.';
 
   @override
-  String get faiBinaryLocateButton => 'Locate `fai` binary…';
+  String get chainBinaryLocateButton => 'Locate `chain` binary…';
 
   @override
-  String get faiBinaryInstallDocsButton => 'Open install guide';
+  String get chainBinaryInstallDocsButton => 'Open install guide';
 
   @override
-  String get faiBinaryPickerTitle => 'Select the `fai` binary';
+  String get chainBinaryPickerTitle => 'Select the `chain` binary';
 
   @override
-  String faiBinarySetOk(String path) {
-    return 'Using `fai` binary at $path';
+  String chainBinarySetOk(String path) {
+    return 'Using `chain` binary at $path';
   }
 
   @override
diff --git a/lib/main.dart b/lib/main.dart
index 021f3be..3046664 100644
--- a/lib/main.dart
+++ b/lib/main.dart
@@ -8,7 +8,7 @@ import 'dart:async';
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 
-import 'data/fai_log.dart';
+import 'data/chain_log.dart';
 import 'data/hub.dart';
 import 'data/system_actions.dart';
 import 'data/theme_plugin.dart';
@@ -22,7 +22,7 @@ import 'pages/store.dart';
 import 'pages/welcome.dart';
 import 'theme/theme.dart';
 import 'theme/tokens.dart';
-import 'widgets/fai_search_palette.dart';
+import 'widgets/chain_search_palette.dart';
 import 'widgets/widgets.dart';
 
 /// Studio's own build version. Bump on every UI commit so the
@@ -55,7 +55,7 @@ class StudioApp extends StatefulWidget {
 
   /// Capability name of the active theme plugin (e.g.
   /// `studio.theme.solarized`) or `null` for the built-in
-  /// FaiTheme.
+  /// ChainTheme.
   final String? initialThemePlugin;
 
   const StudioApp({
@@ -89,7 +89,7 @@ class StudioAppState extends State<StudioApp> {
 
   /// Capability name of the active `studio.theme.*` plugin
   /// (e.g. `studio.theme.solarized`) or `null` for
-  /// FaiTheme's built-in palette. Flipping this triggers a
+  /// ChainTheme's built-in palette. Flipping this triggers a
   /// re-fetch of the plugin's ColorSchemes; the MaterialApp
   /// rebuilds with the new themes.
   late final ValueNotifier<String?> themePluginNotifier;
@@ -188,7 +188,7 @@ class StudioAppState extends State<StudioApp> {
       // own "applied" snackbar is replaced upstream by the
       // friendlier failure message via [themePluginFailed].
       // ignore: discarded_futures
-      FaiLog.instance.error(
+      ChainLog.instance.error(
         'theme.plugin.load',
         e,
         context: 'capability=$capability',
@@ -217,8 +217,8 @@ class StudioAppState extends State<StudioApp> {
                   return MaterialApp(
                     title: 'Ch∆In Studio',
                     debugShowCheckedModeBanner: false,
-                    theme: p.light ?? FaiTheme.light(),
-                    darkTheme: p.dark ?? FaiTheme.dark(),
+                    theme: p.light ?? ChainTheme.light(),
+                    darkTheme: p.dark ?? ChainTheme.dark(),
                     themeMode: _flutterMode(mode),
                     locale: locale,
                     supportedLocales: AppLocalizations.supportedLocales,
@@ -268,7 +268,7 @@ class StudioShellState extends State<StudioShell> {
   /// row and the WelcomePage hero CTA.
   Future<void> startDaemon() async {
     final l = AppLocalizations.of(context)!;
-    final r = await SystemActions.faiDaemon(['start']);
+    final r = await SystemActions.chainDaemon(['start']);
     if (!mounted) return;
     final detail = r.stderr.trim().isEmpty ? r.stdout.trim() : r.stderr.trim();
     ScaffoldMessenger.of(context).showSnackBar(
@@ -325,7 +325,7 @@ class StudioShellState extends State<StudioShell> {
     // (permissions, on-disk path, uninstall) now lives inside
     // the Store's detail sheet, and the Store with the
     // "Installed" filter covers the listing role. Cmd+K still
-    // opens FaiModuleSheet for quick info.
+    // opens ChainModuleSheet for quick info.
     // Flows destination IS the editor as of 0.52.0 — the
     // graph / text / run tabs all live behind one icon. The
     // separate "flow-editor" destination is gone; the Cmd+K
@@ -413,9 +413,9 @@ class StudioShellState extends State<StudioShell> {
   void _openSearchPalette() {
     final l = AppLocalizations.of(context)!;
     final pagesGroup = l.searchGroupPages;
-    final hits = <FaiSearchHit>[
+    final hits = <ChainSearchHit>[
       for (var i = 0; i < _pages.length; i++)
-        FaiSearchHit(
+        ChainSearchHit(
           label: _pages[i].labelOf(context),
           hint: l.searchPageHint(i + 1),
           icon: _pages[i].icon,
@@ -425,18 +425,18 @@ class StudioShellState extends State<StudioShell> {
             setState(() => _selectedIndex = i);
           },
         ),
-      FaiSearchHit(
+      ChainSearchHit(
         label: l.searchSettingsLabel,
         hint: l.searchSettingsHint,
         icon: Icons.settings_outlined,
         group: pagesGroup,
         onSelect: () {
           Navigator.of(context).pop();
-          FaiSettingsDialog.show(context);
+          ChainSettingsDialog.show(context);
         },
       ),
     ];
-    FaiSearchPalette.show(context, staticHits: hits);
+    ChainSearchPalette.show(context, staticHits: hits);
   }
 
   @override
@@ -481,7 +481,7 @@ class StudioShellState extends State<StudioShell> {
           ),
           _OpenSettingsIntent: CallbackAction<_OpenSettingsIntent>(
             onInvoke: (_) {
-              FaiSettingsDialog.show(context);
+              ChainSettingsDialog.show(context);
               return null;
             },
           ),
@@ -513,13 +513,13 @@ class StudioShellState extends State<StudioShell> {
                       if (_hubUnreachable)
                         _HubUnreachableBanner(
                           endpoint: HubService.instance.endpointLabel,
-                          onOpenSettings: () => FaiSettingsDialog.show(context),
+                          onOpenSettings: () => ChainSettingsDialog.show(context),
                         ),
                       Expanded(
                         child: AnimatedSwitcher(
-                          duration: FaiMotion.base,
-                          switchInCurve: FaiMotion.easing,
-                          switchOutCurve: FaiMotion.easing,
+                          duration: ChainMotion.base,
+                          switchInCurve: ChainMotion.easing,
+                          switchOutCurve: ChainMotion.easing,
                           transitionBuilder: (child, anim) => FadeTransition(
                             opacity: anim,
                             child: SlideTransition(
@@ -569,8 +569,8 @@ class _HubUnreachableBanner extends StatelessWidget {
       color: theme.colorScheme.errorContainer,
       child: Padding(
         padding: const EdgeInsets.symmetric(
-          horizontal: FaiSpace.lg,
-          vertical: FaiSpace.sm,
+          horizontal: ChainSpace.lg,
+          vertical: ChainSpace.sm,
         ),
         child: Row(
           children: [
@@ -579,7 +579,7 @@ class _HubUnreachableBanner extends StatelessWidget {
               size: 18,
               color: theme.colorScheme.onErrorContainer,
             ),
-            const SizedBox(width: FaiSpace.sm),
+            const SizedBox(width: ChainSpace.sm),
             Expanded(
               child: Text(
                 l.hubUnreachableBanner(endpoint),
@@ -588,7 +588,7 @@ class _HubUnreachableBanner extends StatelessWidget {
                 ),
               ),
             ),
-            const SizedBox(width: FaiSpace.sm),
+            const SizedBox(width: ChainSpace.sm),
             TextButton(
               onPressed: onOpenSettings,
               child: Text(l.hubUnreachableOpenSettings),
@@ -674,8 +674,8 @@ class _SidebarState extends State<_Sidebar>
       // reveal is a deliberate, eased gesture, not a flicker.
       // The collapse runs faster (reverseDuration) so dismissing
       // the rail feels crisp rather than sluggish.
-      duration: FaiMotion.slow,
-      reverseDuration: FaiMotion.base,
+      duration: ChainMotion.slow,
+      reverseDuration: ChainMotion.base,
       value: 0,
     );
   }
@@ -688,7 +688,7 @@ class _SidebarState extends State<_Sidebar>
 
   Future<void> _startDaemon(BuildContext context) async {
     final l = AppLocalizations.of(context)!;
-    final r = await SystemActions.faiDaemon(['start']);
+    final r = await SystemActions.chainDaemon(['start']);
     if (!context.mounted) return;
     final detail = r.stderr.trim().isEmpty ? r.stdout.trim() : r.stderr.trim();
     ScaffoldMessenger.of(context).showSnackBar(
@@ -704,8 +704,8 @@ class _SidebarState extends State<_Sidebar>
   Widget build(BuildContext context) {
     final theme = Theme.of(context);
     final mode = widget.connected == true
-        ? FaiDeltaMode.live
-        : FaiDeltaMode.idle;
+        ? ChainDeltaMode.live
+        : ChainDeltaMode.idle;
     final hasChannel =
         widget.activeChannel != null && widget.activeChannel!.isNotEmpty;
     return MouseRegion(
@@ -721,7 +721,7 @@ class _SidebarState extends State<_Sidebar>
           return Container(
             width: width,
             color: theme.colorScheme.surfaceContainerLow,
-            padding: const EdgeInsets.symmetric(vertical: FaiSpace.xl),
+            padding: const EdgeInsets.symmetric(vertical: ChainSpace.xl),
             child: ClipRect(
               child: Column(
                 crossAxisAlignment: CrossAxisAlignment.start,
@@ -730,7 +730,7 @@ class _SidebarState extends State<_Sidebar>
                   SizedBox(
                     height: _brandRowH,
                     child: _sidebarRow(
-                      leading: FaiDeltaMark(
+                      leading: ChainDeltaMark(
                         color: theme.colorScheme.primary,
                         mode: mode,
                       ),
@@ -796,7 +796,7 @@ class _SidebarState extends State<_Sidebar>
                           )
                         : const SizedBox.shrink(),
                   ),
-                  const SizedBox(height: FaiSpace.md),
+                  const SizedBox(height: ChainSpace.md),
                   Expanded(
                     child: ListView(
                       padding: EdgeInsets.zero,
@@ -868,7 +868,7 @@ class _SidebarState extends State<_Sidebar>
                   child: Opacity(
                     opacity: t,
                     child: Padding(
-                      padding: const EdgeInsets.only(right: FaiSpace.md),
+                      padding: const EdgeInsets.only(right: ChainSpace.md),
                       child: label,
                     ),
                   ),
@@ -889,7 +889,7 @@ class _SidebarState extends State<_Sidebar>
   }
 
   Future<void> _openSettings(BuildContext context) async {
-    final saved = await FaiSettingsDialog.show(context);
+    final saved = await ChainSettingsDialog.show(context);
     if (saved && context.mounted) {
       // Force a sidebar rebuild so the new endpoint shows in
       // the connection pill.
@@ -911,7 +911,7 @@ class _ChannelPill extends StatelessWidget {
       case 'production':
         return cs.error;
       case 'beta':
-        return FaiColors.warning;
+        return ChainColors.warning;
       case 'dev':
         return cs.primary;
       case 'local':
@@ -943,17 +943,17 @@ class _ChannelPill extends StatelessWidget {
       message: l.sidebarChannelTooltip,
       child: Material(
         color: theme.colorScheme.surfaceContainerHigh,
-        borderRadius: BorderRadius.circular(FaiRadius.sm),
+        borderRadius: BorderRadius.circular(ChainRadius.sm),
         child: InkWell(
-          borderRadius: BorderRadius.circular(FaiRadius.sm),
-          onTap: () => FaiSettingsDialog.show(context),
+          borderRadius: BorderRadius.circular(ChainRadius.sm),
+          onTap: () => ChainSettingsDialog.show(context),
           child: Container(
             padding: const EdgeInsets.symmetric(
-              horizontal: FaiSpace.sm,
+              horizontal: ChainSpace.sm,
               vertical: 4,
             ),
             decoration: BoxDecoration(
-              borderRadius: BorderRadius.circular(FaiRadius.sm),
+              borderRadius: BorderRadius.circular(ChainRadius.sm),
               border: Border.all(color: accent.withValues(alpha: 0.4)),
             ),
             child: Row(
@@ -963,7 +963,7 @@ class _ChannelPill extends StatelessWidget {
                 const SizedBox(width: 4),
                 Text(
                   channel,
-                  style: FaiTheme.mono(
+                  style: ChainTheme.mono(
                     size: 10,
                     weight: FontWeight.w600,
                     color: accent,
@@ -980,7 +980,7 @@ class _ChannelPill extends StatelessWidget {
 
 /// Mini-version of [_ConnectionLabel] used when the sidebar is
 /// collapsed. A 10px dot in the same green/red/amber tonality
-/// the FaiDeltaMark uses for live / idle / unknown.
+/// the ChainDeltaMark uses for live / idle / unknown.
 class _CollapsedConnectionDot extends StatelessWidget {
   final bool? connected;
   const _CollapsedConnectionDot({required this.connected});
@@ -989,10 +989,10 @@ class _CollapsedConnectionDot extends StatelessWidget {
   Widget build(BuildContext context) {
     final theme = Theme.of(context);
     final color = connected == true
-        ? FaiColors.success
+        ? ChainColors.success
         : connected == false
         ? theme.colorScheme.error
-        : FaiColors.warning;
+        : ChainColors.warning;
     return Container(
       width: 10,
       height: 10,
@@ -1025,7 +1025,7 @@ class _CollapsedChannelChip extends StatelessWidget {
       case 'production':
         return cs.error;
       case 'beta':
-        return FaiColors.warning;
+        return ChainColors.warning;
       case 'dev':
         return cs.primary;
       case 'local':
@@ -1053,7 +1053,7 @@ class _CollapsedChannelChip extends StatelessWidget {
       alignment: Alignment.center,
       child: Text(
         _letter,
-        style: FaiTheme.mono(size: 10, weight: FontWeight.w700, color: accent),
+        style: ChainTheme.mono(size: 10, weight: FontWeight.w700, color: accent),
       ),
     );
   }
@@ -1080,7 +1080,7 @@ class _BrandLabel extends StatelessWidget {
         const SizedBox(height: 2),
         Text(
           'v$kStudioVersion',
-          style: FaiTheme.mono(size: 10, color: theme.colorScheme.primary),
+          style: ChainTheme.mono(size: 10, color: theme.colorScheme.primary),
           maxLines: 1,
           overflow: TextOverflow.ellipsis,
         ),
@@ -1133,7 +1133,7 @@ class _ConnectionLabel extends StatelessWidget {
           endpoint,
           maxLines: 1,
           overflow: TextOverflow.ellipsis,
-          style: FaiTheme.mono(
+          style: ChainTheme.mono(
             size: 10,
             color: theme.colorScheme.onSurfaceVariant,
           ),
@@ -1251,7 +1251,7 @@ class _SidebarItemState extends State<_SidebarItem> {
                   child: Opacity(
                     opacity: widget.t,
                     child: Padding(
-                      padding: const EdgeInsets.only(right: FaiSpace.md),
+                      padding: const EdgeInsets.only(right: ChainSpace.md),
                       child: Text(
                         label,
                         overflow: TextOverflow.fade,
@@ -1278,19 +1278,19 @@ class _SidebarItemState extends State<_SidebarItem> {
           behavior: HitTestBehavior.opaque,
           onTap: widget.onTap,
           child: AnimatedContainer(
-            duration: FaiMotion.fast,
+            duration: ChainMotion.fast,
             // No horizontal padding — the icon column anchors
             // the left. The bg highlight spans the rail's
             // current width (typical nav-rail behaviour).
-            padding: const EdgeInsets.symmetric(vertical: FaiSpace.md),
+            padding: const EdgeInsets.symmetric(vertical: ChainSpace.md),
             decoration: BoxDecoration(
               color: bg,
-              borderRadius: BorderRadius.circular(FaiRadius.sm),
+              borderRadius: BorderRadius.circular(ChainRadius.sm),
               // Lift only the selected item — a whisper of depth
               // marks "you are here" without competing with the
               // accent fill.
               boxShadow: widget.selected
-                  ? FaiElevation.low(theme.brightness)
+                  ? ChainElevation.low(theme.brightness)
                   : null,
             ),
             child: content,
@@ -1348,7 +1348,7 @@ class _Footer extends StatelessWidget {
                   child: Opacity(
                     opacity: t,
                     child: Padding(
-                      padding: const EdgeInsets.only(right: FaiSpace.sm),
+                      padding: const EdgeInsets.only(right: ChainSpace.sm),
                       child: Row(
                         children: [
                           _ThemeToggle(),
@@ -1515,7 +1515,7 @@ class _SidebarClockState extends State<_SidebarClock> {
       message: tooltip,
       child: Text(
         '$hh:$mm:$ss',
-        style: FaiTheme.mono(
+        style: ChainTheme.mono(
           size: 11,
           color: theme.colorScheme.onSurfaceVariant.withValues(alpha: 0.85),
         ),
@@ -1553,7 +1553,7 @@ class _LanguageToggle extends StatelessWidget {
             ),
             child: Text(
               isDe ? 'DE' : 'EN',
-              style: FaiTheme.mono(
+              style: ChainTheme.mono(
                 size: 11,
                 weight: FontWeight.w600,
                 color: Theme.of(context).colorScheme.primary,
diff --git a/lib/pages/approvals.dart b/lib/pages/approvals.dart
index f622480..e099c58 100644
--- a/lib/pages/approvals.dart
+++ b/lib/pages/approvals.dart
@@ -224,7 +224,7 @@ class _ApprovalsPageState extends State<ApprovalsPage>
             tooltip: AppLocalizations.of(context)!.approvalsReloadTooltip,
             onPressed: _refresh,
           ),
-          const SizedBox(width: FaiSpace.sm),
+          const SizedBox(width: ChainSpace.sm),
         ],
       ),
       body: TabBarView(
@@ -288,7 +288,7 @@ class _PendingList extends StatelessWidget {
           return const Center(child: CircularProgressIndicator());
         }
         if (snapshot.hasError) {
-          return FaiEmptyState(
+          return ChainEmptyState(
             icon: Icons.cloud_off_outlined,
             iconColor: theme.colorScheme.error,
             title: l.hubUnreachable,
@@ -301,7 +301,7 @@ class _PendingList extends StatelessWidget {
         }
         final pending = snapshot.data ?? [];
         if (pending.isEmpty) {
-          return FaiEmptyState(
+          return ChainEmptyState(
             icon: Icons.task_alt_outlined,
             title: l.approvalsInboxZero,
             hint: l.approvalsInboxHint,
@@ -314,15 +314,15 @@ class _PendingList extends StatelessWidget {
           children: [
             ListView.separated(
               padding: EdgeInsets.fromLTRB(
-                FaiSpace.xl,
-                FaiSpace.xl,
-                FaiSpace.xl,
+                ChainSpace.xl,
+                ChainSpace.xl,
+                ChainSpace.xl,
                 // Keep the last card clear of the floating
                 // batch action bar.
-                selected.isEmpty ? FaiSpace.xl : 96.0,
+                selected.isEmpty ? ChainSpace.xl : 96.0,
               ),
               itemCount: pending.length,
-              separatorBuilder: (_, _) => const SizedBox(height: FaiSpace.md),
+              separatorBuilder: (_, _) => const SizedBox(height: ChainSpace.md),
               itemBuilder: (context, i) {
                 final a = pending[i];
                 final isSelected = selectedIds.contains(a.id);
@@ -337,9 +337,9 @@ class _PendingList extends StatelessWidget {
             ),
             if (selected.isNotEmpty)
               Positioned(
-                left: FaiSpace.xl,
-                right: FaiSpace.xl,
-                bottom: FaiSpace.lg,
+                left: ChainSpace.xl,
+                right: ChainSpace.xl,
+                bottom: ChainSpace.lg,
                 child: _BatchActionBar(
                   selectedCount: selected.length,
                   totalCount: pending.length,
@@ -387,15 +387,15 @@ class _BatchActionBar extends StatelessWidget {
     final l = AppLocalizations.of(context)!;
     return Material(
       elevation: 4,
-      borderRadius: BorderRadius.circular(FaiRadius.md),
+      borderRadius: BorderRadius.circular(ChainRadius.md),
       color: theme.colorScheme.surfaceContainerHigh,
       child: Container(
         padding: const EdgeInsets.symmetric(
-          horizontal: FaiSpace.lg,
-          vertical: FaiSpace.md,
+          horizontal: ChainSpace.lg,
+          vertical: ChainSpace.md,
         ),
         decoration: BoxDecoration(
-          borderRadius: BorderRadius.circular(FaiRadius.md),
+          borderRadius: BorderRadius.circular(ChainRadius.md),
           border: Border.all(color: theme.colorScheme.outlineVariant),
         ),
         child: Row(
@@ -405,14 +405,14 @@ class _BatchActionBar extends StatelessWidget {
               size: 18,
               color: theme.colorScheme.primary,
             ),
-            const SizedBox(width: FaiSpace.sm),
+            const SizedBox(width: ChainSpace.sm),
             Text(
               l.approvalsBatchSelected(selectedCount),
               style: theme.textTheme.bodyMedium?.copyWith(
                 fontWeight: FontWeight.w600,
               ),
             ),
-            const SizedBox(width: FaiSpace.md),
+            const SizedBox(width: ChainSpace.md),
             if (selectedCount < totalCount)
               TextButton(
                 onPressed: inFlight ? null : onSelectAll,
@@ -434,7 +434,7 @@ class _BatchActionBar extends StatelessWidget {
                 ),
               ),
             ),
-            const SizedBox(width: FaiSpace.sm),
+            const SizedBox(width: ChainSpace.sm),
             FilledButton.icon(
               onPressed: inFlight ? null : onApprove,
               icon: inFlight
@@ -470,7 +470,7 @@ class _HistoryList extends StatelessWidget {
           return const Center(child: CircularProgressIndicator());
         }
         if (snapshot.hasError) {
-          return FaiEmptyState(
+          return ChainEmptyState(
             icon: Icons.cloud_off_outlined,
             iconColor: theme.colorScheme.error,
             title: l.hubUnreachable,
@@ -483,16 +483,16 @@ class _HistoryList extends StatelessWidget {
         }
         final decided = snapshot.data ?? [];
         if (decided.isEmpty) {
-          return FaiEmptyState(
+          return ChainEmptyState(
             icon: Icons.history,
             title: l.approvalsHistoryEmpty,
             hint: l.approvalsHistoryEmptyHint,
           );
         }
         return ListView.separated(
-          padding: const EdgeInsets.all(FaiSpace.xl),
+          padding: const EdgeInsets.all(ChainSpace.xl),
           itemCount: decided.length,
-          separatorBuilder: (_, _) => const SizedBox(height: FaiSpace.xs),
+          separatorBuilder: (_, _) => const SizedBox(height: ChainSpace.xs),
           itemBuilder: (context, i) {
             final a = decided[i];
             return _HistoryRow(record: a);
@@ -522,7 +522,7 @@ class _ApprovalCard extends StatelessWidget {
   Widget build(BuildContext context) {
     final theme = Theme.of(context);
     final l = AppLocalizations.of(context)!;
-    return FaiCard(
+    return ChainCard(
       accentTop: true,
       child: Column(
         crossAxisAlignment: CrossAxisAlignment.start,
@@ -534,13 +534,13 @@ class _ApprovalCard extends StatelessWidget {
                 onChanged: (_) => onToggleSelected(),
                 visualDensity: VisualDensity.compact,
               ),
-              const SizedBox(width: FaiSpace.xs),
-              FaiPill(
+              const SizedBox(width: ChainSpace.xs),
+              ChainPill(
                 label: l.approvalsPillPending,
-                tone: FaiPillTone.warning,
+                tone: ChainPillTone.warning,
                 icon: Icons.pending_outlined,
               ),
-              const SizedBox(width: FaiSpace.sm),
+              const SizedBox(width: ChainSpace.sm),
               Expanded(
                 child: Text(
                   '${approval.flowName} › ${approval.stepId}',
@@ -550,17 +550,17 @@ class _ApprovalCard extends StatelessWidget {
                 ),
               ),
               if (approval.expiresAt != null)
-                FaiPill(
+                ChainPill(
                   label: _expiresInLabel(context, approval.expiresAt!),
-                  tone: FaiPillTone.neutral,
+                  tone: ChainPillTone.neutral,
                   icon: Icons.schedule,
                 ),
             ],
           ),
-          const SizedBox(height: FaiSpace.lg),
+          const SizedBox(height: ChainSpace.lg),
           Text(approval.prompt, style: theme.textTheme.bodyLarge),
           if (approval.payloadPreview != null) ...[
-            const SizedBox(height: FaiSpace.md),
+            const SizedBox(height: ChainSpace.md),
             Padding(
               padding: const EdgeInsets.only(bottom: 4),
               child: Text(
@@ -574,27 +574,27 @@ class _ApprovalCard extends StatelessWidget {
             ),
             Container(
               width: double.infinity,
-              padding: const EdgeInsets.all(FaiSpace.md),
+              padding: const EdgeInsets.all(ChainSpace.md),
               decoration: BoxDecoration(
                 color: theme.colorScheme.surfaceContainerHigh,
-                borderRadius: BorderRadius.circular(FaiRadius.sm),
+                borderRadius: BorderRadius.circular(ChainRadius.sm),
                 border: Border.all(color: theme.colorScheme.outlineVariant),
               ),
               child: SelectableText(
                 _prettyPreview(approval.payloadPreview!),
-                style: FaiTheme.mono(
+                style: ChainTheme.mono(
                   size: 11,
                   color: theme.colorScheme.onSurface,
                 ),
               ),
             ),
           ],
-          const SizedBox(height: FaiSpace.lg),
+          const SizedBox(height: ChainSpace.lg),
           Row(
             children: [
               Text(
                 approval.id,
-                style: FaiTheme.mono(
+                style: ChainTheme.mono(
                   size: 10,
                   color: theme.colorScheme.onSurfaceVariant,
                 ),
@@ -611,7 +611,7 @@ class _ApprovalCard extends StatelessWidget {
                   ),
                 ),
               ),
-              const SizedBox(width: FaiSpace.sm),
+              const SizedBox(width: ChainSpace.sm),
               FilledButton.icon(
                 onPressed: onApprove,
                 icon: const Icon(Icons.check, size: 16),
@@ -663,21 +663,21 @@ class _HistoryRow extends StatelessWidget {
         context: context,
         builder: (_) => _HistoryDialog(record: record),
       ),
-      borderRadius: BorderRadius.circular(FaiRadius.sm),
+      borderRadius: BorderRadius.circular(ChainRadius.sm),
       child: Padding(
         padding: const EdgeInsets.symmetric(
-          horizontal: FaiSpace.sm,
-          vertical: FaiSpace.sm,
+          horizontal: ChainSpace.sm,
+          vertical: ChainSpace.sm,
         ),
         child: Row(
           children: [
-            FaiPill(label: label, tone: tone, icon: icon),
-            const SizedBox(width: FaiSpace.md),
+            ChainPill(label: label, tone: tone, icon: icon),
+            const SizedBox(width: ChainSpace.md),
             SizedBox(
               width: 150,
               child: Text(
                 timeStr,
-                style: FaiTheme.mono(
+                style: ChainTheme.mono(
                   size: 11,
                   color: theme.colorScheme.onSurfaceVariant,
                 ),
@@ -693,7 +693,7 @@ class _HistoryRow extends StatelessWidget {
                 overflow: TextOverflow.ellipsis,
               ),
             ),
-            const SizedBox(width: FaiSpace.md),
+            const SizedBox(width: ChainSpace.md),
             if (record.decidedBy.isNotEmpty)
               Text(
                 record.decidedBy,
@@ -707,24 +707,24 @@ class _HistoryRow extends StatelessWidget {
     );
   }
 
-  static (FaiPillTone, IconData, String) _statusPresentation(
+  static (ChainPillTone, IconData, String) _statusPresentation(
     BuildContext context,
     String status,
   ) {
     final l = AppLocalizations.of(context)!;
     switch (status) {
       case 'approved':
-        return (FaiPillTone.success, Icons.check, l.approvalsPillApproved);
+        return (ChainPillTone.success, Icons.check, l.approvalsPillApproved);
       case 'rejected':
-        return (FaiPillTone.danger, Icons.close, l.approvalsPillRejected);
+        return (ChainPillTone.danger, Icons.close, l.approvalsPillRejected);
       case 'expired':
         return (
-          FaiPillTone.neutral,
+          ChainPillTone.neutral,
           Icons.timer_off_outlined,
           l.approvalsPillExpired,
         );
       default:
-        return (FaiPillTone.neutral, Icons.help_outline, status);
+        return (ChainPillTone.neutral, Icons.help_outline, status);
     }
   }
 }
@@ -743,8 +743,8 @@ class _HistoryDialog extends StatelessWidget {
     return AlertDialog(
       title: Row(
         children: [
-          FaiPill(label: label, tone: tone, icon: icon),
-          const SizedBox(width: FaiSpace.sm),
+          ChainPill(label: label, tone: tone, icon: icon),
+          const SizedBox(width: ChainSpace.sm),
           Expanded(
             child: Text(
               '${record.flowName} › ${record.stepId}',
@@ -779,7 +779,7 @@ class _HistoryDialog extends StatelessWidget {
                   AppLocalizations.of(context)!.approvalsDialogReason,
                   record.reason,
                 ),
-              const SizedBox(height: FaiSpace.md),
+              const SizedBox(height: ChainSpace.md),
               Text(
                 AppLocalizations.of(context)!.approvalsDialogPrompt,
                 style: theme.textTheme.labelSmall?.copyWith(
@@ -790,7 +790,7 @@ class _HistoryDialog extends StatelessWidget {
               const SizedBox(height: 4),
               SelectableText(record.prompt, style: theme.textTheme.bodyMedium),
               if (record.payloadPreview != null) ...[
-                const SizedBox(height: FaiSpace.md),
+                const SizedBox(height: ChainSpace.md),
                 Text(
                   AppLocalizations.of(context)!.approvalsPayloadPreview,
                   style: theme.textTheme.labelSmall?.copyWith(
@@ -801,22 +801,22 @@ class _HistoryDialog extends StatelessWidget {
                 const SizedBox(height: 4),
                 Container(
                   width: double.infinity,
-                  padding: const EdgeInsets.all(FaiSpace.sm),
+                  padding: const EdgeInsets.all(ChainSpace.sm),
                   decoration: BoxDecoration(
                     color: theme.colorScheme.surfaceContainerHigh,
-                    borderRadius: BorderRadius.circular(FaiRadius.sm),
+                    borderRadius: BorderRadius.circular(ChainRadius.sm),
                     border: Border.all(color: theme.colorScheme.outlineVariant),
                   ),
                   child: SelectableText(
                     record.payloadPreview!,
-                    style: FaiTheme.mono(size: 11),
+                    style: ChainTheme.mono(size: 11),
                   ),
                 ),
               ],
-              const SizedBox(height: FaiSpace.md),
+              const SizedBox(height: ChainSpace.md),
               Text(
                 record.id,
-                style: FaiTheme.mono(
+                style: ChainTheme.mono(
                   size: 10,
                   color: theme.colorScheme.onSurfaceVariant,
                 ),
diff --git a/lib/pages/audit.dart b/lib/pages/audit.dart
index b292932..422c0ee 100644
--- a/lib/pages/audit.dart
+++ b/lib/pages/audit.dart
@@ -97,7 +97,7 @@ class _AuditPageState extends State<AuditPage> {
         title: Text(AppLocalizations.of(context)!.auditTitle),
         actions: [
           Padding(
-            padding: const EdgeInsets.only(right: FaiSpace.lg),
+            padding: const EdgeInsets.only(right: ChainSpace.lg),
             child: _FilterChips(
               value: _typeFilter,
               onChanged: (v) => setState(() => _typeFilter = v),
@@ -113,7 +113,7 @@ class _AuditPageState extends State<AuditPage> {
             tooltip: AppLocalizations.of(context)!.auditClearLogTooltip,
             onPressed: _onClearPressed,
           ),
-          const SizedBox(width: FaiSpace.sm),
+          const SizedBox(width: ChainSpace.sm),
         ],
       ),
       body: Column(
@@ -123,14 +123,14 @@ class _AuditPageState extends State<AuditPage> {
             child: !_initialLoaded
                 ? const Center(child: CircularProgressIndicator())
                 : _error != null && _events.isEmpty
-                ? FaiEmptyState(
+                ? ChainEmptyState(
                     icon: Icons.cloud_off_outlined,
                     iconColor: theme.colorScheme.error,
                     title: AppLocalizations.of(context)!.hubUnreachable,
                     hint: AppLocalizations.of(context)!.hubUnreachableHint,
                   )
                 : filtered.isEmpty
-                ? FaiEmptyState(
+                ? ChainEmptyState(
                     icon: Icons.timeline_outlined,
                     title: AppLocalizations.of(context)!.auditNoEvents,
                     hint: AppLocalizations.of(context)!.auditNoEventsHint,
@@ -187,7 +187,7 @@ class _AuditPageState extends State<AuditPage> {
   Color _toneFor(String type, ThemeData theme) {
     if (type.endsWith('.failed')) return theme.colorScheme.error;
     if (type.endsWith('.completed')) return theme.colorScheme.primary;
-    if (type.endsWith('.started')) return FaiColors.warning;
+    if (type.endsWith('.started')) return ChainColors.warning;
     return theme.colorScheme.outline;
   }
 }
@@ -220,15 +220,15 @@ class _GroupedEventList extends StatelessWidget {
     final l = AppLocalizations.of(context)!;
     final items = _itemsWithHeaders(events, l);
     return ListView.builder(
-      padding: const EdgeInsets.all(FaiSpace.xl),
+      padding: const EdgeInsets.all(ChainSpace.xl),
       itemCount: items.length,
       itemBuilder: (context, i) {
         final item = items[i];
         if (item is _GroupHeader) {
           return Padding(
             padding: EdgeInsets.only(
-              top: i == 0 ? 0 : FaiSpace.lg,
-              bottom: FaiSpace.sm,
+              top: i == 0 ? 0 : ChainSpace.lg,
+              bottom: ChainSpace.sm,
             ),
             child: Text(
               item.label,
@@ -242,8 +242,8 @@ class _GroupedEventList extends StatelessWidget {
         }
         final e = (item as _EventItem).event;
         return Padding(
-          padding: const EdgeInsets.only(bottom: FaiSpace.xs),
-          child: FaiDataRow(
+          padding: const EdgeInsets.only(bottom: ChainSpace.xs),
+          child: ChainDataRow(
             accent: toneFor(e.type),
             leading: formatTime(e.timestamp),
             title: e.type,
@@ -328,7 +328,7 @@ class _FilterChips extends StatelessWidget {
       children: [
         for (final (v, label) in items)
           Padding(
-            padding: const EdgeInsets.only(left: FaiSpace.xs),
+            padding: const EdgeInsets.only(left: ChainSpace.xs),
             child: _ChipButton(
               label: label,
               selected: value == v,
@@ -378,14 +378,14 @@ class _ChipButtonState extends State<_ChipButton> {
       child: GestureDetector(
         onTap: widget.onTap,
         child: AnimatedContainer(
-          duration: FaiMotion.fast,
+          duration: ChainMotion.fast,
           padding: const EdgeInsets.symmetric(
-            horizontal: FaiSpace.md,
+            horizontal: ChainSpace.md,
             vertical: 6,
           ),
           decoration: BoxDecoration(
             color: bg,
-            borderRadius: BorderRadius.circular(FaiRadius.sm),
+            borderRadius: BorderRadius.circular(ChainRadius.sm),
             border: Border.all(
               color: widget.selected
                   ? theme.colorScheme.primary.withValues(alpha: 0.3)
@@ -394,7 +394,7 @@ class _ChipButtonState extends State<_ChipButton> {
           ),
           child: Text(
             widget.label,
-            style: FaiTheme.mono(
+            style: ChainTheme.mono(
               size: 11,
               weight: widget.selected ? FontWeight.w500 : FontWeight.w400,
               color: fg,
@@ -420,8 +420,8 @@ class _LiveStatusBar extends StatelessWidget {
     return Container(
       width: double.infinity,
       padding: const EdgeInsets.symmetric(
-        horizontal: FaiSpace.xl,
-        vertical: FaiSpace.sm,
+        horizontal: ChainSpace.xl,
+        vertical: ChainSpace.sm,
       ),
       decoration: BoxDecoration(
         color: theme.colorScheme.surfaceContainerHigh,
@@ -431,11 +431,11 @@ class _LiveStatusBar extends StatelessWidget {
       ),
       child: Row(
         children: [
-          FaiStatusDot(
-            color: live ? FaiColors.success : FaiColors.danger,
+          ChainStatusDot(
+            color: live ? ChainColors.success : ChainColors.danger,
             pulsing: live,
           ),
-          const SizedBox(width: FaiSpace.sm),
+          const SizedBox(width: ChainSpace.sm),
           Text(
             live ? l.auditLiveStatus(eventCount) : l.auditDisconnected(error!),
             style: theme.textTheme.bodySmall?.copyWith(
@@ -569,7 +569,7 @@ class _EventDetailDialogState extends State<_EventDetailDialog> {
     return AlertDialog(
       title: Text(event.type),
       shape: RoundedRectangleBorder(
-        borderRadius: BorderRadius.circular(FaiRadius.md),
+        borderRadius: BorderRadius.circular(ChainRadius.md),
       ),
       content: ConstrainedBox(
         constraints: const BoxConstraints(maxWidth: 640, maxHeight: 560),
@@ -616,7 +616,7 @@ class _EventDetailDialogState extends State<_EventDetailDialog> {
                   valueColor: theme.colorScheme.error,
                 ),
               if (detail.isNotEmpty) ...[
-                const SizedBox(height: FaiSpace.md),
+                const SizedBox(height: ChainSpace.md),
                 Text(
                   l.auditDetailHeader,
                   style: theme.textTheme.labelSmall?.copyWith(
@@ -627,17 +627,17 @@ class _EventDetailDialogState extends State<_EventDetailDialog> {
                 const SizedBox(height: 4),
                 Container(
                   width: double.infinity,
-                  padding: const EdgeInsets.all(FaiSpace.md),
+                  padding: const EdgeInsets.all(ChainSpace.md),
                   decoration: BoxDecoration(
                     color: theme.colorScheme.surfaceContainerHigh,
-                    borderRadius: BorderRadius.circular(FaiRadius.sm),
+                    borderRadius: BorderRadius.circular(ChainRadius.sm),
                     border: Border.all(color: theme.colorScheme.outlineVariant),
                   ),
-                  child: SelectableText(detail, style: FaiTheme.mono(size: 11)),
+                  child: SelectableText(detail, style: ChainTheme.mono(size: 11)),
                 ),
               ],
               if (_explanation != null || _explaining) ...[
-                const SizedBox(height: FaiSpace.lg),
+                const SizedBox(height: ChainSpace.lg),
                 _ExplanationPanel(
                   explaining: _explaining,
                   result: _explanation,
@@ -729,7 +729,7 @@ class _FlowRunDialog extends StatelessWidget {
     return AlertDialog(
       title: Text(l.auditFlowRunDialogTitle(flowName)),
       shape: RoundedRectangleBorder(
-        borderRadius: BorderRadius.circular(FaiRadius.md),
+        borderRadius: BorderRadius.circular(ChainRadius.md),
       ),
       content: ConstrainedBox(
         constraints: BoxConstraints(maxWidth: 640, maxHeight: maxHeight),
@@ -743,15 +743,15 @@ class _FlowRunDialog extends StatelessWidget {
                 color: theme.colorScheme.onSurfaceVariant,
               ),
             ),
-            const SizedBox(height: FaiSpace.md),
+            const SizedBox(height: ChainSpace.md),
             Flexible(
               child: ListView.separated(
                 shrinkWrap: true,
                 itemCount: related.length,
-                separatorBuilder: (_, _) => const SizedBox(height: FaiSpace.xs),
+                separatorBuilder: (_, _) => const SizedBox(height: ChainSpace.xs),
                 itemBuilder: (context, i) {
                   final e = related[i];
-                  return FaiDataRow(
+                  return ChainDataRow(
                     accent: _toneFor(e.type, theme),
                     leading: _formatRelativeTime(e.timestamp),
                     title: e.type,
@@ -792,7 +792,7 @@ class _FlowRunDialog extends StatelessWidget {
   Color _toneFor(String type, ThemeData theme) {
     if (type.endsWith('.failed')) return theme.colorScheme.error;
     if (type.endsWith('.completed')) return theme.colorScheme.primary;
-    if (type.endsWith('.started')) return FaiColors.warning;
+    if (type.endsWith('.started')) return ChainColors.warning;
     return theme.colorScheme.outline;
   }
 }
@@ -831,7 +831,7 @@ class _Field extends StatelessWidget {
             child: SelectableText(
               value,
               style: mono
-                  ? FaiTheme.mono(
+                  ? ChainTheme.mono(
                       size: 11,
                       color: valueColor ?? theme.colorScheme.onSurface,
                     )
@@ -875,10 +875,10 @@ class _ExplanationPanel extends StatelessWidget {
         : theme.colorScheme.error;
     return Container(
       width: double.infinity,
-      padding: const EdgeInsets.all(FaiSpace.md),
+      padding: const EdgeInsets.all(ChainSpace.md),
       decoration: BoxDecoration(
         color: theme.colorScheme.surfaceContainerHigh,
-        borderRadius: BorderRadius.circular(FaiRadius.sm),
+        borderRadius: BorderRadius.circular(ChainRadius.sm),
         border: Border.all(color: color.withValues(alpha: 0.3)),
       ),
       child: Column(
@@ -887,7 +887,7 @@ class _ExplanationPanel extends StatelessWidget {
           Row(
             children: [
               Icon(Icons.auto_awesome, size: 14, color: color),
-              const SizedBox(width: FaiSpace.xs),
+              const SizedBox(width: ChainSpace.xs),
               Text(
                 l.auditSystemAi,
                 style: theme.textTheme.labelSmall?.copyWith(
@@ -895,15 +895,15 @@ class _ExplanationPanel extends StatelessWidget {
                   letterSpacing: 0.6,
                 ),
               ),
-              const SizedBox(width: FaiSpace.xs),
-              FaiPill(
+              const SizedBox(width: ChainSpace.xs),
+              ChainPill(
                 label: privacyMode,
                 tone: privacyMode == 'full'
-                    ? FaiPillTone.warning
-                    : FaiPillTone.neutral,
+                    ? ChainPillTone.warning
+                    : ChainPillTone.neutral,
               ),
               if (result != null && result!.isSuccess && result!.cached) ...[
-                const SizedBox(width: FaiSpace.xs),
+                const SizedBox(width: ChainSpace.xs),
                 Tooltip(
                   message: () {
                     final hits = result!.cacheHits > 1
@@ -913,9 +913,9 @@ class _ExplanationPanel extends StatelessWidget {
                         ? l.auditCachedTooltipUnknown(hits)
                         : l.auditCachedTooltipKnown(result!.cachedAt, hits);
                   }(),
-                  child: FaiPill(
+                  child: ChainPill(
                     label: l.auditCachedPill,
-                    tone: FaiPillTone.success,
+                    tone: ChainPillTone.success,
                     icon: Icons.bolt,
                   ),
                 ),
@@ -926,7 +926,7 @@ class _ExplanationPanel extends StatelessWidget {
                   result!.cached
                       ? l.auditOriginalLatency(result!.latencyMs)
                       : l.auditLatency(result!.latencyMs),
-                  style: FaiTheme.mono(
+                  style: ChainTheme.mono(
                     size: 10,
                     color: theme.colorScheme.onSurfaceVariant,
                   ),
@@ -934,7 +934,7 @@ class _ExplanationPanel extends StatelessWidget {
               if (result != null &&
                   result!.isSuccess &&
                   onRegenerate != null) ...[
-                const SizedBox(width: FaiSpace.sm),
+                const SizedBox(width: ChainSpace.sm),
                 Tooltip(
                   message: l.auditRegenerateTooltip,
                   child: IconButton(
@@ -946,7 +946,7 @@ class _ExplanationPanel extends StatelessWidget {
               ],
             ],
           ),
-          const SizedBox(height: FaiSpace.sm),
+          const SizedBox(height: ChainSpace.sm),
           if (explaining)
             Row(
               children: [
@@ -955,7 +955,7 @@ class _ExplanationPanel extends StatelessWidget {
                   height: 14,
                   child: CircularProgressIndicator(strokeWidth: 2),
                 ),
-                const SizedBox(width: FaiSpace.sm),
+                const SizedBox(width: ChainSpace.sm),
                 Text(
                   l.auditAskingFull,
                   style: theme.textTheme.bodySmall?.copyWith(
@@ -974,7 +974,7 @@ class _ExplanationPanel extends StatelessWidget {
               ),
             ),
             if (result!.fixHint(l).isNotEmpty) ...[
-              const SizedBox(height: FaiSpace.sm),
+              const SizedBox(height: ChainSpace.sm),
               Text(
                 l.auditFixLabel,
                 style: theme.textTheme.labelSmall?.copyWith(
@@ -1063,7 +1063,7 @@ class _ClearAuditDialogState extends State<_ClearAuditDialog> {
                 color: theme.colorScheme.onSurfaceVariant,
               ),
             ),
-            const SizedBox(height: FaiSpace.lg),
+            const SizedBox(height: ChainSpace.lg),
             TextField(
               controller: _reviewer,
               decoration: InputDecoration(
@@ -1072,7 +1072,7 @@ class _ClearAuditDialogState extends State<_ClearAuditDialog> {
                 isDense: true,
               ),
             ),
-            const SizedBox(height: FaiSpace.md),
+            const SizedBox(height: ChainSpace.md),
             ValueListenableBuilder<TextEditingValue>(
               valueListenable: _reason,
               builder: (_, _, _) => TextField(
diff --git a/lib/pages/doctor.dart b/lib/pages/doctor.dart
index 5f1fc5d..1271a34 100644
--- a/lib/pages/doctor.dart
+++ b/lib/pages/doctor.dart
@@ -1,7 +1,7 @@
 import 'package:flutter/material.dart';
 
 import '../data/error_presentation.dart';
-import '../data/fai_log.dart';
+import '../data/chain_log.dart';
 import '../data/hub.dart';
 import '../data/system_actions.dart';
 import '../l10n/app_localizations.dart';
@@ -47,7 +47,7 @@ class _DoctorPageState extends State<DoctorPage> {
             tooltip: AppLocalizations.of(context)!.doctorRecheckTooltip,
             onPressed: _refresh,
           ),
-          const SizedBox(width: FaiSpace.sm),
+          const SizedBox(width: ChainSpace.sm),
         ],
       ),
       body: FutureBuilder<DoctorSnapshot>(
@@ -58,7 +58,7 @@ class _DoctorPageState extends State<DoctorPage> {
           }
           if (snapshot.hasError) {
             final l = AppLocalizations.of(context)!;
-            return FaiEmptyState(
+            return ChainEmptyState(
               icon: Icons.cloud_off_outlined,
               iconColor: Theme.of(context).colorScheme.error,
               title: l.hubUnreachable,
@@ -74,34 +74,34 @@ class _DoctorPageState extends State<DoctorPage> {
               s.update.updateAvailable ||
               (!s.update.manifestReachable && s.update.localVersion.isNotEmpty);
           return ListView(
-            padding: const EdgeInsets.all(FaiSpace.xl),
+            padding: const EdgeInsets.all(ChainSpace.xl),
             children: [
               if (showUpdate) _UpdateBanner(status: s.update),
-              if (showUpdate) const SizedBox(height: FaiSpace.lg),
+              if (showUpdate) const SizedBox(height: ChainSpace.lg),
               _SummaryStrip(snapshot: s),
-              const SizedBox(height: FaiSpace.xl),
+              const SizedBox(height: ChainSpace.xl),
               _Section(
                 title: AppLocalizations.of(context)!.doctorEventLogSection,
                 child: _EventLogPanel(snapshot: s, onRefresh: _refresh),
               ),
-              const SizedBox(height: FaiSpace.lg),
+              const SizedBox(height: ChainSpace.lg),
               _Section(
                 title: AppLocalizations.of(
                   context,
                 )!.doctorModulesApprovalsSection,
                 child: _ModulesPanel(snapshot: s),
               ),
-              const SizedBox(height: FaiSpace.lg),
+              const SizedBox(height: ChainSpace.lg),
               _Section(
                 title: AppLocalizations.of(context)!.doctorHostServicesSection,
                 child: _ServicesPanel(snapshot: s),
               ),
-              const SizedBox(height: FaiSpace.lg),
+              const SizedBox(height: ChainSpace.lg),
               _Section(
                 title: AppLocalizations.of(context)!.doctorDaemonFilesSection,
                 child: _DaemonPathsPanel(paths: s.paths),
               ),
-              const SizedBox(height: FaiSpace.lg),
+              const SizedBox(height: ChainSpace.lg),
               _Section(
                 title: AppLocalizations.of(context)!.doctorDaemonControlSection,
                 child: _DaemonActionsCard(),
@@ -128,8 +128,8 @@ class _Section extends StatelessWidget {
       children: [
         Padding(
           padding: const EdgeInsets.only(
-            left: FaiSpace.xs,
-            bottom: FaiSpace.sm,
+            left: ChainSpace.xs,
+            bottom: ChainSpace.sm,
           ),
           child: Text(
             title.toUpperCase(),
@@ -162,17 +162,17 @@ class _SummaryStrip extends StatelessWidget {
           subtitle: l.doctorSummaryCapabilities(snapshot.capabilityCount),
           icon: Icons.extension_outlined,
         ),
-        const SizedBox(width: FaiSpace.md),
+        const SizedBox(width: ChainSpace.md),
         _StatTile(
           label: l.doctorSummaryApprovals,
           value: snapshot.pendingApprovals.toString(),
           subtitle: l.doctorSummaryPending,
           icon: Icons.inbox_outlined,
           tone: snapshot.pendingApprovals > 0
-              ? FaiPillTone.warning
-              : FaiPillTone.neutral,
+              ? ChainPillTone.warning
+              : ChainPillTone.neutral,
         ),
-        const SizedBox(width: FaiSpace.md),
+        const SizedBox(width: ChainSpace.md),
         _StatTile(
           label: l.doctorSummaryAudit,
           value: snapshot.chainHealthy ? '✓' : '⚠',
@@ -182,10 +182,10 @@ class _SummaryStrip extends StatelessWidget {
           ),
           icon: Icons.shield_outlined,
           tone: snapshot.chainHealthy
-              ? FaiPillTone.success
-              : FaiPillTone.danger,
+              ? ChainPillTone.success
+              : ChainPillTone.danger,
         ),
-        const SizedBox(width: FaiSpace.md),
+        const SizedBox(width: ChainSpace.md),
         _StatTile(
           label: l.doctorSummaryServices,
           value: snapshot.services.length.toString(),
@@ -202,36 +202,36 @@ class _StatTile extends StatelessWidget {
   final String value;
   final String subtitle;
   final IconData icon;
-  final FaiPillTone tone;
+  final ChainPillTone tone;
 
   const _StatTile({
     required this.label,
     required this.value,
     required this.subtitle,
     required this.icon,
-    this.tone = FaiPillTone.neutral,
+    this.tone = ChainPillTone.neutral,
   });
 
   @override
   Widget build(BuildContext context) {
     final theme = Theme.of(context);
     final accentColor = switch (tone) {
-      FaiPillTone.success => FaiColors.success,
-      FaiPillTone.warning => FaiColors.warning,
-      FaiPillTone.danger => theme.colorScheme.error,
+      ChainPillTone.success => ChainColors.success,
+      ChainPillTone.warning => ChainColors.warning,
+      ChainPillTone.danger => theme.colorScheme.error,
       _ => theme.colorScheme.primary,
     };
     return Expanded(
-      child: FaiCard(
+      child: ChainCard(
         accentLeft: accentColor,
-        padding: const EdgeInsets.all(FaiSpace.lg),
+        padding: const EdgeInsets.all(ChainSpace.lg),
         child: Column(
           crossAxisAlignment: CrossAxisAlignment.start,
           children: [
             Row(
               children: [
                 Icon(icon, size: 14, color: theme.colorScheme.onSurfaceVariant),
-                const SizedBox(width: FaiSpace.xs),
+                const SizedBox(width: ChainSpace.xs),
                 Flexible(
                   child: Text(
                     label.toUpperCase(),
@@ -245,7 +245,7 @@ class _StatTile extends StatelessWidget {
                 ),
               ],
             ),
-            const SizedBox(height: FaiSpace.sm),
+            const SizedBox(height: ChainSpace.sm),
             Text(
               value,
               style: theme.textTheme.displaySmall?.copyWith(
@@ -282,15 +282,15 @@ class _EventLogPanel extends StatelessWidget {
     final theme = Theme.of(context);
     final healthy = snapshot.chainHealthy;
     final l = AppLocalizations.of(context)!;
-    return FaiCard(
+    return ChainCard(
       child: Row(
         children: [
           Icon(
             healthy ? Icons.verified_outlined : Icons.gpp_bad_outlined,
             size: 24,
-            color: healthy ? FaiColors.success : theme.colorScheme.error,
+            color: healthy ? ChainColors.success : theme.colorScheme.error,
           ),
-          const SizedBox(width: FaiSpace.lg),
+          const SizedBox(width: ChainSpace.lg),
           Expanded(
             child: Column(
               crossAxisAlignment: CrossAxisAlignment.start,
@@ -322,10 +322,10 @@ class _EventLogPanel extends StatelessWidget {
             icon: const Icon(Icons.fact_check_outlined, size: 16),
             label: Text(l.doctorVerifyNow),
           ),
-          const SizedBox(width: FaiSpace.sm),
-          FaiPill(
+          const SizedBox(width: ChainSpace.sm),
+          ChainPill(
             label: healthy ? l.doctorChainPillOk : l.doctorChainPillTamper,
-            tone: healthy ? FaiPillTone.success : FaiPillTone.danger,
+            tone: healthy ? ChainPillTone.success : ChainPillTone.danger,
           ),
         ],
       ),
@@ -353,7 +353,7 @@ class _DaemonPathsPanel extends StatelessWidget {
       (l.doctorPathLog, paths.logPath, Icons.description_outlined, false),
       (
         l.doctorPathStudioErrors,
-        FaiLog.instance.path,
+        ChainLog.instance.path,
         Icons.report_problem_outlined,
         false,
       ),
@@ -365,7 +365,7 @@ class _DaemonPathsPanel extends StatelessWidget {
     ].where((e) => e.$2.isNotEmpty).toList();
 
     if (entries.isEmpty) {
-      return FaiCard(
+      return ChainCard(
         child: Text(
           l.doctorPathsEmpty,
           style: Theme.of(context).textTheme.bodySmall,
@@ -373,7 +373,7 @@ class _DaemonPathsPanel extends StatelessWidget {
       );
     }
 
-    return FaiCard(
+    return ChainCard(
       child: Column(
         crossAxisAlignment: CrossAxisAlignment.start,
         children: [
@@ -416,7 +416,7 @@ class _PathRow extends StatelessWidget {
       child: Row(
         children: [
           Icon(icon, size: 16, color: theme.colorScheme.onSurfaceVariant),
-          const SizedBox(width: FaiSpace.sm),
+          const SizedBox(width: ChainSpace.sm),
           SizedBox(
             width: 90,
             child: Text(
@@ -429,13 +429,13 @@ class _PathRow extends StatelessWidget {
           Expanded(
             child: SelectableText(
               path,
-              style: FaiTheme.mono(
+              style: ChainTheme.mono(
                 size: 11,
                 color: theme.colorScheme.onSurface,
               ),
             ),
           ),
-          const SizedBox(width: FaiSpace.sm),
+          const SizedBox(width: ChainSpace.sm),
           if (isLog || isConfig) ...[
             OutlinedButton.icon(
               onPressed: () => isConfig
@@ -447,7 +447,7 @@ class _PathRow extends StatelessWidget {
                 visualDensity: VisualDensity.compact,
               ),
             ),
-            const SizedBox(width: FaiSpace.xs),
+            const SizedBox(width: ChainSpace.xs),
           ],
           OutlinedButton.icon(
             onPressed: () async {
@@ -494,7 +494,7 @@ class _DaemonActionsCardState extends State<_DaemonActionsCard> {
 
   /// True when the last daemon action failed because no `fai`
   /// binary could be located. Swaps the raw output line for the
-  /// actionable [FaiBinaryRecovery] block.
+  /// actionable [ChainBinaryRecovery] block.
   bool _binaryMissing = false;
   ChannelStatusSnapshot? _channels;
 
@@ -557,7 +557,7 @@ class _DaemonActionsCardState extends State<_DaemonActionsCard> {
         }
       }
     }
-    return FaiCard(
+    return ChainCard(
       // Row + Expanded forces the card to take the full width
       // its parent offers. Without this, the card hugs the
       // intrinsic width of the longest button row and ends up
@@ -575,10 +575,10 @@ class _DaemonActionsCardState extends State<_DaemonActionsCard> {
                       : Icons.power_off_outlined,
                   size: 18,
                   color: active?.running == true
-                      ? FaiColors.success
+                      ? ChainColors.success
                       : theme.colorScheme.onSurfaceVariant,
                 ),
-                const SizedBox(width: FaiSpace.sm),
+                const SizedBox(width: ChainSpace.sm),
                 Expanded(
                   child: Text(
                     active == null
@@ -593,36 +593,36 @@ class _DaemonActionsCardState extends State<_DaemonActionsCard> {
                   ),
                 ),
                 if (active != null) ...[
-                  const SizedBox(width: FaiSpace.sm),
-                  FaiPill(
+                  const SizedBox(width: ChainSpace.sm),
+                  ChainPill(
                     label: active.running
                         ? l.doctorPillRunning
                         : l.doctorPillStopped,
                     tone: active.running
-                        ? FaiPillTone.success
-                        : FaiPillTone.neutral,
+                        ? ChainPillTone.success
+                        : ChainPillTone.neutral,
                   ),
                 ],
               ],
             ),
-            const SizedBox(height: FaiSpace.sm),
+            const SizedBox(height: ChainSpace.sm),
             Text(
               l.doctorDaemonControlHint,
               style: theme.textTheme.bodySmall?.copyWith(
                 color: theme.colorScheme.onSurfaceVariant,
               ),
             ),
-            const SizedBox(height: FaiSpace.md),
+            const SizedBox(height: ChainSpace.md),
             Wrap(
-              spacing: FaiSpace.sm,
-              runSpacing: FaiSpace.sm,
+              spacing: ChainSpace.sm,
+              runSpacing: ChainSpace.sm,
               children: [
                 FilledButton.tonalIcon(
                   onPressed: _busy
                       ? null
                       : () => _run(
                           l.daemonActionRestart,
-                          () => SystemActions.faiDaemon(['restart']),
+                          () => SystemActions.chainDaemon(['restart']),
                         ),
                   icon: const Icon(Icons.restart_alt, size: 16),
                   label: Text(l.doctorRestart),
@@ -633,7 +633,7 @@ class _DaemonActionsCardState extends State<_DaemonActionsCard> {
                         ? null
                         : () => _run(
                             l.daemonActionStart,
-                            () => SystemActions.faiDaemon(['start']),
+                            () => SystemActions.chainDaemon(['start']),
                           ),
                     icon: const Icon(Icons.play_arrow, size: 16),
                     label: Text(l.doctorStart),
@@ -643,7 +643,7 @@ class _DaemonActionsCardState extends State<_DaemonActionsCard> {
                       ? null
                       : () => _run(
                           l.daemonActionStop,
-                          () => SystemActions.faiDaemon(['stop']),
+                          () => SystemActions.chainDaemon(['stop']),
                         ),
                   icon: const Icon(Icons.stop_circle_outlined, size: 16),
                   label: Text(l.doctorStop),
@@ -653,7 +653,7 @@ class _DaemonActionsCardState extends State<_DaemonActionsCard> {
                       ? null
                       : () => _run(
                           l.daemonActionStatus,
-                          () => SystemActions.faiDaemon(['status']),
+                          () => SystemActions.chainDaemon(['status']),
                         ),
                   icon: const Icon(Icons.health_and_safety_outlined, size: 16),
                   label: Text(l.doctorStatusAction),
@@ -661,7 +661,7 @@ class _DaemonActionsCardState extends State<_DaemonActionsCard> {
               ],
             ),
             if (_busy) ...[
-              const SizedBox(height: FaiSpace.md),
+              const SizedBox(height: ChainSpace.md),
               Row(
                 children: [
                   const SizedBox(
@@ -669,7 +669,7 @@ class _DaemonActionsCardState extends State<_DaemonActionsCard> {
                     height: 14,
                     child: CircularProgressIndicator(strokeWidth: 2),
                   ),
-                  const SizedBox(width: FaiSpace.sm),
+                  const SizedBox(width: ChainSpace.sm),
                   Text(
                     l.doctorDaemonControlWorking,
                     style: theme.textTheme.bodySmall?.copyWith(
@@ -680,27 +680,27 @@ class _DaemonActionsCardState extends State<_DaemonActionsCard> {
               ),
             ],
             if (_binaryMissing) ...[
-              const SizedBox(height: FaiSpace.md),
-              FaiBinaryRecovery(
+              const SizedBox(height: ChainSpace.md),
+              ChainBinaryRecovery(
                 onLocated: () => _run(
                   l.daemonActionStatus,
-                  () => SystemActions.faiDaemon(['status']),
+                  () => SystemActions.chainDaemon(['status']),
                 ),
               ),
             ],
             if (_output != null) ...[
-              const SizedBox(height: FaiSpace.md),
+              const SizedBox(height: ChainSpace.md),
               Container(
                 width: double.infinity,
-                padding: const EdgeInsets.all(FaiSpace.sm),
+                padding: const EdgeInsets.all(ChainSpace.sm),
                 decoration: BoxDecoration(
                   color: theme.colorScheme.surfaceContainerHigh,
-                  borderRadius: BorderRadius.circular(FaiRadius.sm),
+                  borderRadius: BorderRadius.circular(ChainRadius.sm),
                   border: Border.all(color: theme.colorScheme.outlineVariant),
                 ),
                 child: SelectableText(
                   _output!,
-                  style: FaiTheme.mono(
+                  style: ChainTheme.mono(
                     size: 11,
                     color: theme.colorScheme.onSurface,
                   ),
@@ -732,7 +732,7 @@ class _ModulesPanel extends StatelessWidget {
   Widget build(BuildContext context) {
     final theme = Theme.of(context);
     final l = AppLocalizations.of(context)!;
-    return FaiCard(
+    return ChainCard(
       child: Column(
         crossAxisAlignment: CrossAxisAlignment.start,
         children: [
@@ -743,7 +743,7 @@ class _ModulesPanel extends StatelessWidget {
                 size: 18,
                 color: theme.colorScheme.onSurfaceVariant,
               ),
-              const SizedBox(width: FaiSpace.sm),
+              const SizedBox(width: ChainSpace.sm),
               Expanded(
                 child: Column(
                   crossAxisAlignment: CrossAxisAlignment.start,
@@ -767,17 +767,17 @@ class _ModulesPanel extends StatelessWidget {
                   ],
                 ),
               ),
-              FaiPill(
+              ChainPill(
                 label: snapshot.moduleCount > 0
                     ? l.doctorPillLoaded
                     : l.doctorPillEmpty,
                 tone: snapshot.moduleCount > 0
-                    ? FaiPillTone.success
-                    : FaiPillTone.neutral,
+                    ? ChainPillTone.success
+                    : ChainPillTone.neutral,
               ),
             ],
           ),
-          const Divider(height: FaiSpace.xl),
+          const Divider(height: ChainSpace.xl),
           Row(
             children: [
               Icon(
@@ -785,7 +785,7 @@ class _ModulesPanel extends StatelessWidget {
                 size: 18,
                 color: theme.colorScheme.onSurfaceVariant,
               ),
-              const SizedBox(width: FaiSpace.sm),
+              const SizedBox(width: ChainSpace.sm),
               Text(
                 snapshot.pendingApprovals == 0
                     ? l.doctorApprovalsNone
@@ -794,9 +794,9 @@ class _ModulesPanel extends StatelessWidget {
               ),
               const Spacer(),
               if (snapshot.pendingApprovals > 0)
-                FaiPill(
+                ChainPill(
                   label: l.doctorApprovalsAttentionPill,
-                  tone: FaiPillTone.warning,
+                  tone: ChainPillTone.warning,
                 ),
             ],
           ),
@@ -819,10 +819,10 @@ class _ServicesPanel extends StatelessWidget {
       // Wrap on narrow windows so the mono-spaced hint
       // (`add to ~/.chain/config.yaml under services:`) does not
       // overflow horizontally past the card's right edge.
-      return FaiCard(
+      return ChainCard(
         child: Wrap(
-          spacing: FaiSpace.sm,
-          runSpacing: FaiSpace.xs,
+          spacing: ChainSpace.sm,
+          runSpacing: ChainSpace.xs,
           crossAxisAlignment: WrapCrossAlignment.center,
           children: [
             Row(
@@ -833,7 +833,7 @@ class _ServicesPanel extends StatelessWidget {
                   size: 18,
                   color: theme.colorScheme.onSurfaceVariant,
                 ),
-                const SizedBox(width: FaiSpace.sm),
+                const SizedBox(width: ChainSpace.sm),
                 Text(
                   l.doctorServicesEmpty,
                   style: theme.textTheme.bodyMedium?.copyWith(
@@ -844,7 +844,7 @@ class _ServicesPanel extends StatelessWidget {
             ),
             Text(
               l.doctorServicesEmptyHint,
-              style: FaiTheme.mono(
+              style: ChainTheme.mono(
                 size: 11,
                 color: theme.colorScheme.onSurfaceVariant,
               ),
@@ -853,7 +853,7 @@ class _ServicesPanel extends StatelessWidget {
         ),
       );
     }
-    return FaiCard(
+    return ChainCard(
       padding: EdgeInsets.zero,
       child: Column(
         children: [
@@ -861,7 +861,7 @@ class _ServicesPanel extends StatelessWidget {
             if (i > 0)
               Divider(height: 1, color: theme.colorScheme.outlineVariant),
             Padding(
-              padding: const EdgeInsets.all(FaiSpace.lg),
+              padding: const EdgeInsets.all(ChainSpace.lg),
               child: Row(
                 children: [
                   Icon(
@@ -869,25 +869,25 @@ class _ServicesPanel extends StatelessWidget {
                     size: 16,
                     color: theme.colorScheme.primary,
                   ),
-                  const SizedBox(width: FaiSpace.sm),
+                  const SizedBox(width: ChainSpace.sm),
                   Text(
                     snapshot.services[i].name,
                     style: theme.textTheme.titleSmall?.copyWith(
                       fontWeight: FontWeight.w600,
                     ),
                   ),
-                  const SizedBox(width: FaiSpace.md),
+                  const SizedBox(width: ChainSpace.md),
                   Text(
                     snapshot.services[i].endpoint,
-                    style: FaiTheme.mono(
+                    style: ChainTheme.mono(
                       size: 11,
                       color: theme.colorScheme.onSurfaceVariant,
                     ),
                   ),
                   const Spacer(),
                   for (final tag in snapshot.services[i].tags) ...[
-                    FaiPill(label: tag, tone: FaiPillTone.neutral),
-                    const SizedBox(width: FaiSpace.xs),
+                    ChainPill(label: tag, tone: ChainPillTone.neutral),
+                    const SizedBox(width: ChainSpace.xs),
                   ],
                 ],
               ),
@@ -917,7 +917,7 @@ class _UpdateBannerState extends State<_UpdateBanner> {
       _applying = true;
       _applyOutput = null;
     });
-    final r = await SystemActions.faiUpdateApply(widget.status.channel);
+    final r = await SystemActions.chainUpdateApply(widget.status.channel);
     if (!mounted) return;
     setState(() {
       _applying = false;
@@ -945,7 +945,7 @@ class _UpdateBannerState extends State<_UpdateBanner> {
     final body = available
         ? l.doctorUpdateBody(status.channel, status.latestVersion)
         : (status.reason ?? l.doctorUpdateUnreachableBody(status.channel));
-    return FaiCard(
+    return ChainCard(
       child: Column(
         crossAxisAlignment: CrossAxisAlignment.start,
         children: [
@@ -953,7 +953,7 @@ class _UpdateBannerState extends State<_UpdateBanner> {
             crossAxisAlignment: CrossAxisAlignment.start,
             children: [
               Icon(iconData, size: 20, color: iconColor),
-              const SizedBox(width: FaiSpace.md),
+              const SizedBox(width: ChainSpace.md),
               Expanded(
                 child: Column(
                   crossAxisAlignment: CrossAxisAlignment.start,
@@ -967,7 +967,7 @@ class _UpdateBannerState extends State<_UpdateBanner> {
                     const SizedBox(height: 2),
                     Text(
                       body,
-                      style: FaiTheme.mono(
+                      style: ChainTheme.mono(
                         size: 11,
                         color: theme.colorScheme.onSurfaceVariant,
                       ),
@@ -976,7 +976,7 @@ class _UpdateBannerState extends State<_UpdateBanner> {
                       const SizedBox(height: 4),
                       Text(
                         l.doctorReleaseNotes(status.releaseNotesUrl!),
-                        style: FaiTheme.mono(
+                        style: ChainTheme.mono(
                           size: 11,
                           color: theme.colorScheme.primary,
                         ),
@@ -999,16 +999,16 @@ class _UpdateBannerState extends State<_UpdateBanner> {
                     _applying ? l.doctorApplying : l.doctorApplyUpdate,
                   ),
                 ),
-              const SizedBox(width: FaiSpace.sm),
-              FaiPill(
+              const SizedBox(width: ChainSpace.sm),
+              ChainPill(
                 label: available ? l.doctorPillNew : l.doctorPillOffline,
-                tone: available ? FaiPillTone.success : FaiPillTone.neutral,
+                tone: available ? ChainPillTone.success : ChainPillTone.neutral,
               ),
             ],
           ),
           if (_applyOutput != null) ...[
-            const SizedBox(height: FaiSpace.md),
-            FaiErrorBox(text: _applyOutput!, maxHeight: 240),
+            const SizedBox(height: ChainSpace.md),
+            ChainErrorBox(text: _applyOutput!, maxHeight: 240),
           ],
         ],
       ),
diff --git a/lib/pages/federation.dart b/lib/pages/federation.dart
index 3f744aa..b82baaf 100644
--- a/lib/pages/federation.dart
+++ b/lib/pages/federation.dart
@@ -103,7 +103,7 @@ class _FederationPageState extends State<FederationPage> {
             tooltip: l.federationReloadTooltip,
             onPressed: _refresh,
           ),
-          const SizedBox(width: FaiSpace.sm),
+          const SizedBox(width: ChainSpace.sm),
         ],
       ),
       floatingActionButton: FloatingActionButton.extended(
@@ -118,7 +118,7 @@ class _FederationPageState extends State<FederationPage> {
             return const Center(child: CircularProgressIndicator());
           }
           if (snapshot.hasError) {
-            return FaiEmptyState(
+            return ChainEmptyState(
               icon: Icons.cloud_off_outlined,
               iconColor: theme.colorScheme.error,
               title: l.hubUnreachable,
@@ -131,7 +131,7 @@ class _FederationPageState extends State<FederationPage> {
           }
           final sats = snapshot.data ?? [];
           if (sats.isEmpty) {
-            return FaiEmptyState(
+            return ChainEmptyState(
               icon: Icons.hub_outlined,
               title: l.federationEmptyTitle,
               hint: l.federationEmptyHint,
@@ -143,9 +143,9 @@ class _FederationPageState extends State<FederationPage> {
             );
           }
           return ListView.separated(
-            padding: const EdgeInsets.all(FaiSpace.xl),
+            padding: const EdgeInsets.all(ChainSpace.xl),
             itemCount: sats.length,
-            separatorBuilder: (_, _) => const SizedBox(height: FaiSpace.md),
+            separatorBuilder: (_, _) => const SizedBox(height: ChainSpace.md),
             itemBuilder: (context, i) => _SatelliteCard(satellite: sats[i]),
           );
         },
@@ -162,19 +162,19 @@ class _SatelliteCard extends StatelessWidget {
   Widget build(BuildContext context) {
     final theme = Theme.of(context);
     final l = AppLocalizations.of(context)!;
-    return FaiCard(
+    return ChainCard(
       accentTop: true,
       child: Column(
         crossAxisAlignment: CrossAxisAlignment.start,
         children: [
           Row(
             children: [
-              FaiPill(
+              ChainPill(
                 label: l.federationPillConnected,
-                tone: FaiPillTone.success,
+                tone: ChainPillTone.success,
                 icon: Icons.link,
               ),
-              const SizedBox(width: FaiSpace.sm),
+              const SizedBox(width: ChainSpace.sm),
               Expanded(
                 child: Text(
                   satellite.displayName,
@@ -183,19 +183,19 @@ class _SatelliteCard extends StatelessWidget {
                   ),
                 ),
               ),
-              FaiPill(
+              ChainPill(
                 label: satellite.region.isEmpty
                     ? l.federationRegionNone
                     : satellite.region,
-                tone: FaiPillTone.neutral,
+                tone: ChainPillTone.neutral,
                 icon: Icons.public,
               ),
             ],
           ),
-          const SizedBox(height: FaiSpace.md),
+          const SizedBox(height: ChainSpace.md),
           Wrap(
-            spacing: FaiSpace.md,
-            runSpacing: FaiSpace.xs,
+            spacing: ChainSpace.md,
+            runSpacing: ChainSpace.xs,
             children: [
               _meta(theme, 'v${satellite.hubVersion}'),
               _meta(theme, 'wire ${satellite.wireVersion}'),
@@ -203,7 +203,7 @@ class _SatelliteCard extends StatelessWidget {
             ],
           ),
           if (satellite.capabilities.isNotEmpty) ...[
-            const SizedBox(height: FaiSpace.md),
+            const SizedBox(height: ChainSpace.md),
             Text(
               l.federationCapabilities(satellite.capabilities.length),
               style: theme.textTheme.labelSmall?.copyWith(
@@ -213,13 +213,13 @@ class _SatelliteCard extends StatelessWidget {
             ),
             const SizedBox(height: 4),
             Wrap(
-              spacing: FaiSpace.xs,
-              runSpacing: FaiSpace.xs,
+              spacing: ChainSpace.xs,
+              runSpacing: ChainSpace.xs,
               children: satellite.capabilities
                   .map(
-                    (c) => FaiPill(
+                    (c) => ChainPill(
                       label: c,
-                      tone: FaiPillTone.accent,
+                      tone: ChainPillTone.accent,
                       icon: Icons.extension_outlined,
                     ),
                   )
@@ -233,7 +233,7 @@ class _SatelliteCard extends StatelessWidget {
 
   Widget _meta(ThemeData theme, String text) => Text(
     text,
-    style: FaiTheme.mono(size: 10, color: theme.colorScheme.onSurfaceVariant),
+    style: ChainTheme.mono(size: 10, color: theme.colorScheme.onSurfaceVariant),
   );
 }
 
@@ -261,11 +261,11 @@ class _EnrollmentDialog extends StatelessWidget {
               Text(l.federationTokenLabel, style: theme.textTheme.labelSmall),
               const SizedBox(height: 4),
               _CopyableBlock(text: enrollment.token, copiedMsg: l.federationCopied),
-              const SizedBox(height: FaiSpace.md),
+              const SizedBox(height: ChainSpace.md),
               Text(l.federationConfigLabel, style: theme.textTheme.labelSmall),
               const SizedBox(height: 4),
               _CopyableBlock(text: config, copiedMsg: l.federationCopied),
-              const SizedBox(height: FaiSpace.md),
+              const SizedBox(height: ChainSpace.md),
               Text(
                 l.federationEnrollmentHint,
                 style: theme.textTheme.bodySmall?.copyWith(
@@ -299,19 +299,19 @@ class _CopyableBlock extends StatelessWidget {
         Container(
           width: double.infinity,
           padding: const EdgeInsets.fromLTRB(
-            FaiSpace.md,
-            FaiSpace.md,
+            ChainSpace.md,
+            ChainSpace.md,
             40,
-            FaiSpace.md,
+            ChainSpace.md,
           ),
           decoration: BoxDecoration(
             color: theme.colorScheme.surfaceContainerHigh,
-            borderRadius: BorderRadius.circular(FaiRadius.sm),
+            borderRadius: BorderRadius.circular(ChainRadius.sm),
             border: Border.all(color: theme.colorScheme.outlineVariant),
           ),
           child: SelectableText(
             text,
-            style: FaiTheme.mono(size: 11, color: theme.colorScheme.onSurface),
+            style: ChainTheme.mono(size: 11, color: theme.colorScheme.onSurface),
           ),
         ),
         Positioned(
diff --git a/lib/pages/modules.dart b/lib/pages/modules.dart
index 88628db..24ccf40 100644
--- a/lib/pages/modules.dart
+++ b/lib/pages/modules.dart
@@ -48,7 +48,7 @@ class _ModulesPageState extends State<ModulesPage> {
             tooltip: AppLocalizations.of(context)!.modulesReloadTooltip,
             onPressed: _refresh,
           ),
-          const SizedBox(width: FaiSpace.sm),
+          const SizedBox(width: ChainSpace.sm),
         ],
       ),
       body: FutureBuilder<List<ModuleSummary>>(
@@ -59,7 +59,7 @@ class _ModulesPageState extends State<ModulesPage> {
             return const Center(child: CircularProgressIndicator());
           }
           if (snapshot.hasError) {
-            return FaiEmptyState(
+            return ChainEmptyState(
               icon: Icons.cloud_off_outlined,
               iconColor: Theme.of(context).colorScheme.error,
               title: l.hubUnreachable,
@@ -72,22 +72,22 @@ class _ModulesPageState extends State<ModulesPage> {
           }
           final modules = snapshot.data ?? [];
           if (modules.isEmpty) {
-            return FaiEmptyState(
+            return ChainEmptyState(
               icon: Icons.extension_outlined,
               title: l.modulesNoneTitle,
               hint: l.modulesNoneHint,
             );
           }
           return ListView(
-            padding: const EdgeInsets.all(FaiSpace.xl),
+            padding: const EdgeInsets.all(ChainSpace.xl),
             children: [
               _RecentActivityPanel(future: _historyFuture),
-              const SizedBox(height: FaiSpace.md),
+              const SizedBox(height: ChainSpace.md),
               for (var i = 0; i < modules.length; i++) ...[
-                if (i > 0) const SizedBox(height: FaiSpace.md),
+                if (i > 0) const SizedBox(height: ChainSpace.md),
                 GestureDetector(
                   onTap: () async {
-                    final uninstalled = await FaiModuleSheet.show(
+                    final uninstalled = await ChainModuleSheet.show(
                       context,
                       modules[i].name,
                     );
@@ -116,7 +116,7 @@ class _ModuleCard extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     final theme = Theme.of(context);
-    return FaiCard(
+    return ChainCard(
       child: Column(
         crossAxisAlignment: CrossAxisAlignment.start,
         children: [
@@ -128,15 +128,15 @@ class _ModuleCard extends StatelessWidget {
                   fontWeight: FontWeight.w600,
                 ),
               ),
-              const SizedBox(width: FaiSpace.sm),
-              FaiPill(
+              const SizedBox(width: ChainSpace.sm),
+              ChainPill(
                 label: 'v${module.version}',
-                tone: FaiPillTone.neutral,
+                tone: ChainPillTone.neutral,
                 monospace: true,
               ),
             ],
           ),
-          const SizedBox(height: FaiSpace.md),
+          const SizedBox(height: ChainSpace.md),
           Row(
             crossAxisAlignment: CrossAxisAlignment.start,
             children: [
@@ -152,13 +152,13 @@ class _ModuleCard extends StatelessWidget {
               ),
               Expanded(
                 child: Wrap(
-                  spacing: FaiSpace.xs,
-                  runSpacing: FaiSpace.xs,
+                  spacing: ChainSpace.xs,
+                  runSpacing: ChainSpace.xs,
                   children: module.capabilities
                       .map(
-                        (c) => FaiPill(
+                        (c) => ChainPill(
                           label: c,
-                          tone: FaiPillTone.accent,
+                          tone: ChainPillTone.accent,
                           monospace: true,
                         ),
                       )
@@ -192,12 +192,12 @@ class _RecentActivityPanel extends StatelessWidget {
         if (events.isEmpty) return const SizedBox.shrink();
         return Container(
           padding: const EdgeInsets.symmetric(
-            horizontal: FaiSpace.md,
-            vertical: FaiSpace.sm,
+            horizontal: ChainSpace.md,
+            vertical: ChainSpace.sm,
           ),
           decoration: BoxDecoration(
             color: theme.colorScheme.surfaceContainer,
-            borderRadius: BorderRadius.circular(FaiRadius.sm),
+            borderRadius: BorderRadius.circular(ChainRadius.sm),
             border: Border.all(color: theme.colorScheme.outlineVariant),
           ),
           child: Column(
@@ -219,7 +219,7 @@ class _RecentActivityPanel extends StatelessWidget {
                       fontSize: 10,
                     ),
                   ),
-                  const SizedBox(width: FaiSpace.sm),
+                  const SizedBox(width: ChainSpace.sm),
                   Text(
                     AppLocalizations.of(
                       context,
@@ -230,7 +230,7 @@ class _RecentActivityPanel extends StatelessWidget {
                   ),
                 ],
               ),
-              const SizedBox(height: FaiSpace.xs),
+              const SizedBox(height: ChainSpace.xs),
               for (final e in events) _ActivityRow(event: e),
             ],
           ),
@@ -248,7 +248,7 @@ class _ActivityRow extends StatelessWidget {
   Widget build(BuildContext context) {
     final theme = Theme.of(context);
     final installed = event.type == 'module.installed';
-    final accent = installed ? FaiColors.success : FaiColors.warning;
+    final accent = installed ? ChainColors.success : ChainColors.warning;
     return Padding(
       padding: const EdgeInsets.symmetric(vertical: 2),
       child: Row(
@@ -263,7 +263,7 @@ class _ActivityRow extends StatelessWidget {
             width: 150,
             child: Text(
               _formatTimestamp(event.timestamp.toLocal()),
-              style: FaiTheme.mono(
+              style: ChainTheme.mono(
                 size: 10,
                 color: theme.colorScheme.onSurfaceVariant,
               ),
diff --git a/lib/pages/store.dart b/lib/pages/store.dart
index 935d75b..2614c35 100644
--- a/lib/pages/store.dart
+++ b/lib/pages/store.dart
@@ -203,10 +203,10 @@ class _StorePageState extends State<StorePage> {
       backgroundColor: theme.scaffoldBackgroundColor,
       appBar: AppBar(
         // titleSpacing matches the body's horizontal padding
-        // (FaiSpace.xl == 24) so the title's left edge sits
+        // (ChainSpace.xl == 24) so the title's left edge sits
         // flush with the cards below. Default 16 left a 8-px
         // gap that read as a misaligned heading.
-        titleSpacing: FaiSpace.xl,
+        titleSpacing: ChainSpace.xl,
         title: Text(l.searchGroupStore),
         actions: [
           FutureBuilder<List<StoreItem>>(
@@ -215,7 +215,7 @@ class _StorePageState extends State<StorePage> {
               final raw = snap.data ?? const <StoreItem>[];
               final categories = _categoriesIn(raw);
               return Padding(
-                padding: const EdgeInsets.only(right: FaiSpace.sm),
+                padding: const EdgeInsets.only(right: ChainSpace.sm),
                 child: _CategoryDropdown(
                   categories: categories,
                   selected: _category,
@@ -228,7 +228,7 @@ class _StorePageState extends State<StorePage> {
             },
           ),
           Padding(
-            padding: const EdgeInsets.only(right: FaiSpace.sm),
+            padding: const EdgeInsets.only(right: ChainSpace.sm),
             child: _FilterButton(
               activeCount: _activeFilterCount(),
               onPressed: _openFilterDialog,
@@ -243,7 +243,7 @@ class _StorePageState extends State<StorePage> {
           // to match the body's right-side padding. The icon
           // glyph itself ends up flush with the rightmost grid
           // card, not floating in space.
-          const SizedBox(width: FaiSpace.md),
+          const SizedBox(width: ChainSpace.md),
         ],
       ),
       body: Column(
@@ -255,9 +255,9 @@ class _StorePageState extends State<StorePage> {
           Expanded(
             child: Padding(
               padding: const EdgeInsets.fromLTRB(
-                FaiSpace.xl,
-                FaiSpace.lg,
-                FaiSpace.xl,
+                ChainSpace.xl,
+                ChainSpace.lg,
+                ChainSpace.xl,
                 0,
               ),
               child: FutureBuilder<List<StoreItem>>(
@@ -267,7 +267,7 @@ class _StorePageState extends State<StorePage> {
                     return const Center(child: CircularProgressIndicator());
                   }
                   if (snap.hasError) {
-                    return FaiEmptyState(
+                    return ChainEmptyState(
                       icon: Icons.cloud_off_outlined,
                       iconColor: theme.colorScheme.error,
                       title: l.hubUnreachable,
@@ -281,7 +281,7 @@ class _StorePageState extends State<StorePage> {
                   final raw = snap.data ?? const <StoreItem>[];
                   final items = _applyAllFilters(raw);
                   if (items.isEmpty) {
-                    return FaiEmptyState(
+                    return ChainEmptyState(
                       icon: Icons.search_off,
                       title: l.storeNoMatches,
                       hint: l.storeNoMatchesHint,
@@ -355,7 +355,7 @@ class _StorePageState extends State<StorePage> {
                             error: _aiError,
                             onClear: _clearQuery,
                           ),
-                          const SizedBox(height: FaiSpace.lg),
+                          const SizedBox(height: ChainSpace.lg),
                         ],
                         if (showToday) ...[
                           _StoreTodayHero(
@@ -404,7 +404,7 @@ class _StorePageState extends State<StorePage> {
                             recommendedAdding: _addingSources,
                             onAddRecommended: _addRecommendedSource,
                           ),
-                          const SizedBox(height: FaiSpace.lg),
+                          const SizedBox(height: ChainSpace.lg),
                         ],
                         if (showStandaloneRecommended) ...[
                           _RecommendedSourcesStrip(
@@ -412,7 +412,7 @@ class _StorePageState extends State<StorePage> {
                             locale: _locale,
                             onAdd: _addRecommendedSource,
                           ),
-                          const SizedBox(height: FaiSpace.lg),
+                          const SizedBox(height: ChainSpace.lg),
                         ],
                         if (showFeatured) ...[
                           _FeaturedStrip(
@@ -421,7 +421,7 @@ class _StorePageState extends State<StorePage> {
                             onTap: _openDetail,
                             onInstall: _install,
                           ),
-                          const SizedBox(height: FaiSpace.lg),
+                          const SizedBox(height: ChainSpace.lg),
                         ],
                         _StoreGrid(
                           items: items,
@@ -430,7 +430,7 @@ class _StorePageState extends State<StorePage> {
                           onTap: _openDetail,
                           onInstall: _install,
                         ),
-                        const SizedBox(height: FaiSpace.lg),
+                        const SizedBox(height: ChainSpace.lg),
                       ],
                     ),
                   );
@@ -450,8 +450,8 @@ class _StorePageState extends State<StorePage> {
               ),
             ),
             padding: const EdgeInsets.symmetric(
-              horizontal: FaiSpace.xl,
-              vertical: FaiSpace.md,
+              horizontal: ChainSpace.xl,
+              vertical: ChainSpace.md,
             ),
             child: _AskBar(
               controller: _queryCtrl,
@@ -564,7 +564,7 @@ class _StorePageState extends State<StorePage> {
       case TodayCta.none:
         return null;
       case TodayCta.openSettings:
-        return () => FaiSettingsDialog.show(context);
+        return () => ChainSettingsDialog.show(context);
       case TodayCta.filterCategory:
         if (story.ctaPayload.isEmpty) return null;
         return () {
@@ -792,7 +792,7 @@ String _categoryDisplayName(BuildContext ctx, String wire) {
 /// Map a permission string (`net:api.example.com`,
 /// `fs.read:/etc/fai`, `env:OPENAI_API_KEY`, …) to a glyph the
 /// operator can read at a glance. Mirrors the table that used
-/// to live in `fai_module_sheet.dart` so the Store detail-sheet
+/// to live in `chain_module_sheet.dart` so the Store detail-sheet
 /// can render permissions in the same shape after the Modules
 /// page was dropped.
 IconData _iconForPermission(String permission) {
@@ -850,12 +850,12 @@ class _AskBar extends StatelessWidget {
         final empty = value.text.trim().isEmpty;
         return Container(
           padding: const EdgeInsets.symmetric(
-            horizontal: FaiSpace.md,
-            vertical: FaiSpace.sm,
+            horizontal: ChainSpace.md,
+            vertical: ChainSpace.sm,
           ),
           decoration: BoxDecoration(
             color: theme.colorScheme.surfaceContainerHigh,
-            borderRadius: BorderRadius.circular(FaiRadius.md),
+            borderRadius: BorderRadius.circular(ChainRadius.md),
             border: Border.all(color: theme.colorScheme.outlineVariant),
           ),
           child: Row(
@@ -869,7 +869,7 @@ class _AskBar extends StatelessWidget {
                   color: theme.colorScheme.onSurfaceVariant,
                 ),
               ),
-              const SizedBox(width: FaiSpace.sm),
+              const SizedBox(width: ChainSpace.sm),
               Expanded(
                 // Cmd+Enter (or Ctrl+Enter on Linux) submits;
                 // bare Enter inserts a newline so the operator
@@ -928,7 +928,7 @@ class _AskBar extends StatelessWidget {
                   tooltip: l.storeAskClear,
                   onPressed: onClear,
                 ),
-              const SizedBox(width: FaiSpace.xs),
+              const SizedBox(width: ChainSpace.xs),
               FilledButton.icon(
                 onPressed: thinking ? null : onSubmit,
                 icon: thinking
@@ -979,7 +979,7 @@ class _FilterButton extends StatelessWidget {
         children: [
           Text(l.storeFilterLabel),
           if (activeCount > 0) ...[
-            const SizedBox(width: FaiSpace.xs),
+            const SizedBox(width: ChainSpace.xs),
             Container(
               padding: const EdgeInsets.symmetric(horizontal: 6, vertical: 1),
               decoration: BoxDecoration(
@@ -1065,8 +1065,8 @@ class _FilterDialogState extends State<_FilterDialog> {
       String selected,
       void Function(String) onSelect,
     ) => Wrap(
-      spacing: FaiSpace.xs,
-      runSpacing: FaiSpace.xs,
+      spacing: ChainSpace.xs,
+      runSpacing: ChainSpace.xs,
       children: [
         for (final i in items)
           _ChoiceChip(
@@ -1079,7 +1079,7 @@ class _FilterDialogState extends State<_FilterDialog> {
     return AlertDialog(
       title: Text(l.storeFilterLabel),
       shape: RoundedRectangleBorder(
-        borderRadius: BorderRadius.circular(FaiRadius.md),
+        borderRadius: BorderRadius.circular(ChainRadius.md),
       ),
       content: ConstrainedBox(
         constraints: const BoxConstraints(maxWidth: 460),
@@ -1098,7 +1098,7 @@ class _FilterDialogState extends State<_FilterDialog> {
               _status,
               (v) => setState(() => _status = v),
             ),
-            const SizedBox(height: FaiSpace.lg),
+            const SizedBox(height: ChainSpace.lg),
             header(l.storeFilterSourceGroup),
             chipRow(
               [
@@ -1111,11 +1111,11 @@ class _FilterDialogState extends State<_FilterDialog> {
               _source,
               (v) => setState(() => _source = v),
             ),
-            const SizedBox(height: FaiSpace.lg),
+            const SizedBox(height: ChainSpace.lg),
             header(l.storeFilterInstalledGroup),
             Wrap(
-              spacing: FaiSpace.xs,
-              runSpacing: FaiSpace.xs,
+              spacing: ChainSpace.xs,
+              runSpacing: ChainSpace.xs,
               children: [
                 FilterChip(
                   label: Text(l.storeInstallableOnly),
@@ -1208,10 +1208,10 @@ class _AiAnswerCard extends StatelessWidget {
         : theme.colorScheme.primary;
     return Container(
       width: double.infinity,
-      padding: const EdgeInsets.all(FaiSpace.md),
+      padding: const EdgeInsets.all(ChainSpace.md),
       decoration: BoxDecoration(
         color: theme.colorScheme.surfaceContainerHigh,
-        borderRadius: BorderRadius.circular(FaiRadius.md),
+        borderRadius: BorderRadius.circular(ChainRadius.md),
         border: Border.all(color: accent.withValues(alpha: 0.3)),
       ),
       child: Column(
@@ -1220,7 +1220,7 @@ class _AiAnswerCard extends StatelessWidget {
           Row(
             children: [
               Icon(Icons.auto_awesome, size: 14, color: accent),
-              const SizedBox(width: FaiSpace.xs),
+              const SizedBox(width: ChainSpace.xs),
               Text(
                 l.storeAskAnswerLabel,
                 style: theme.textTheme.labelSmall?.copyWith(
@@ -1238,7 +1238,7 @@ class _AiAnswerCard extends StatelessWidget {
               ),
             ],
           ),
-          const SizedBox(height: FaiSpace.xs),
+          const SizedBox(height: ChainSpace.xs),
           if (thinking)
             Row(
               children: [
@@ -1247,7 +1247,7 @@ class _AiAnswerCard extends StatelessWidget {
                   height: 14,
                   child: CircularProgressIndicator(strokeWidth: 2),
                 ),
-                const SizedBox(width: FaiSpace.sm),
+                const SizedBox(width: ChainSpace.sm),
                 Text(
                   l.storeAskAiThinking,
                   style: theme.textTheme.bodyMedium?.copyWith(
@@ -1269,7 +1269,7 @@ class _AiAnswerCard extends StatelessWidget {
               style: theme.textTheme.bodyMedium,
             ),
             if (matches.isNotEmpty) ...[
-              const SizedBox(height: FaiSpace.sm),
+              const SizedBox(height: ChainSpace.sm),
               Text(
                 l.storeAskAnswerWhy,
                 style: theme.textTheme.labelSmall?.copyWith(
@@ -1296,12 +1296,12 @@ class _AiAnswerCard extends StatelessWidget {
                       ),
                       Expanded(
                         child: Wrap(
-                          spacing: FaiSpace.xs,
+                          spacing: ChainSpace.xs,
                           crossAxisAlignment: WrapCrossAlignment.center,
                           children: [
                             Text(
                               m.name,
-                              style: FaiTheme.mono(
+                              style: ChainTheme.mono(
                                 size: 12,
                                 weight: FontWeight.w600,
                                 color: theme.colorScheme.onSurface,
@@ -1365,11 +1365,11 @@ class _CategoryDropdown extends StatelessWidget {
       ],
       child: Container(
         padding: const EdgeInsets.symmetric(
-          horizontal: FaiSpace.sm,
+          horizontal: ChainSpace.sm,
           vertical: 6,
         ),
         decoration: BoxDecoration(
-          borderRadius: BorderRadius.circular(FaiRadius.sm),
+          borderRadius: BorderRadius.circular(ChainRadius.sm),
           border: Border.all(color: theme.colorScheme.outlineVariant),
         ),
         child: Row(
@@ -1475,7 +1475,7 @@ class _ChoiceChip extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     return Padding(
-      padding: const EdgeInsets.only(right: FaiSpace.xs),
+      padding: const EdgeInsets.only(right: ChainSpace.xs),
       child: ChoiceChip(
         label: Text(label),
         selected: selected,
@@ -1526,8 +1526,8 @@ class _StoreGrid extends StatelessWidget {
           physics: const NeverScrollableScrollPhysics(),
           gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(
             crossAxisCount: cols,
-            mainAxisSpacing: FaiSpace.md,
-            crossAxisSpacing: FaiSpace.md,
+            mainAxisSpacing: ChainSpace.md,
+            crossAxisSpacing: ChainSpace.md,
             mainAxisExtent: 168,
           ),
           itemCount: items.length,
@@ -1572,7 +1572,7 @@ class _FeaturedStrip extends StatelessWidget {
       children: [
         Row(
           children: [
-            Icon(Icons.star, size: 14, color: FaiColors.success),
+            Icon(Icons.star, size: 14, color: ChainColors.success),
             const SizedBox(width: 6),
             Text(
               l.storeFeatured,
@@ -1582,7 +1582,7 @@ class _FeaturedStrip extends StatelessWidget {
                 fontSize: 10,
               ),
             ),
-            const SizedBox(width: FaiSpace.sm),
+            const SizedBox(width: ChainSpace.sm),
             Text(
               l.storeFeaturedHint,
               style: theme.textTheme.bodySmall?.copyWith(
@@ -1591,7 +1591,7 @@ class _FeaturedStrip extends StatelessWidget {
             ),
           ],
         ),
-        const SizedBox(height: FaiSpace.sm),
+        const SizedBox(height: ChainSpace.sm),
         SizedBox(
           // Tiles render larger than regular grid cards
           // (which are 168 × ~360) so the editorial picks
@@ -1601,7 +1601,7 @@ class _FeaturedStrip extends StatelessWidget {
           child: ListView.separated(
             scrollDirection: Axis.horizontal,
             itemCount: items.length,
-            separatorBuilder: (_, _) => const SizedBox(width: FaiSpace.md),
+            separatorBuilder: (_, _) => const SizedBox(width: ChainSpace.md),
             itemBuilder: (context, i) {
               final item = items[i];
               return SizedBox(
@@ -1644,14 +1644,14 @@ class _FeaturedTile extends StatelessWidget {
     final installable = item.status == 'published' || item.status == 'alpha';
     return Material(
       color: theme.colorScheme.surfaceContainer,
-      borderRadius: BorderRadius.circular(FaiRadius.md),
+      borderRadius: BorderRadius.circular(ChainRadius.md),
       child: InkWell(
         onTap: onTap,
-        borderRadius: BorderRadius.circular(FaiRadius.md),
+        borderRadius: BorderRadius.circular(ChainRadius.md),
         child: Container(
-          padding: const EdgeInsets.all(FaiSpace.lg),
+          padding: const EdgeInsets.all(ChainSpace.lg),
           decoration: BoxDecoration(
-            borderRadius: BorderRadius.circular(FaiRadius.md),
+            borderRadius: BorderRadius.circular(ChainRadius.md),
             gradient: LinearGradient(
               colors: [
                 theme.colorScheme.primary.withValues(alpha: 0.14),
@@ -1677,7 +1677,7 @@ class _FeaturedTile extends StatelessWidget {
                       color: theme.colorScheme.primary,
                     ),
                   ),
-                  const SizedBox(width: FaiSpace.md),
+                  const SizedBox(width: ChainSpace.md),
                   Expanded(
                     child: Column(
                       crossAxisAlignment: CrossAxisAlignment.start,
@@ -1702,10 +1702,10 @@ class _FeaturedTile extends StatelessWidget {
                       ],
                     ),
                   ),
-                  Icon(Icons.star, size: 18, color: FaiColors.success),
+                  Icon(Icons.star, size: 18, color: ChainColors.success),
                 ],
               ),
-              const SizedBox(height: FaiSpace.md),
+              const SizedBox(height: ChainSpace.md),
               Expanded(
                 child: Column(
                   crossAxisAlignment: CrossAxisAlignment.start,
@@ -1719,7 +1719,7 @@ class _FeaturedTile extends StatelessWidget {
                       // rewrites it on the fly.
                       Padding(
                         padding: const EdgeInsets.only(bottom: 4),
-                        child: FaiEnBadge.forContext(context),
+                        child: ChainEnBadge.forContext(context),
                       ),
                     Expanded(
                       child: Text(
@@ -1732,7 +1732,7 @@ class _FeaturedTile extends StatelessWidget {
                   ],
                 ),
               ),
-              const SizedBox(height: FaiSpace.sm),
+              const SizedBox(height: ChainSpace.sm),
               Row(
                 children: [
                   if (item.bestVersion.isNotEmpty)
@@ -1745,25 +1745,25 @@ class _FeaturedTile extends StatelessWidget {
                       message: item.isFederated
                           ? l.storeAdvisoryVersionTooltip
                           : '',
-                      child: FaiPill(
+                      child: ChainPill(
                         label: item.isFederated
                             ? '~v${item.bestVersion}'
                             : 'v${item.bestVersion}',
-                        tone: FaiPillTone.neutral,
+                        tone: ChainPillTone.neutral,
                         monospace: true,
                       ),
                     ),
-                  const SizedBox(width: FaiSpace.xs),
+                  const SizedBox(width: ChainSpace.xs),
                   if (item.status.isNotEmpty)
-                    FaiPill(
+                    ChainPill(
                       label: _statusDisplayName(context, item.status),
                       tone: _toneForStatus(item.status),
                     ),
                   const Spacer(),
                   if (item.installed)
-                    FaiPill(
+                    ChainPill(
                       label: l.storePillInstalled,
-                      tone: FaiPillTone.success,
+                      tone: ChainPillTone.success,
                       icon: Icons.check,
                     )
                   else if (installable)
@@ -1777,9 +1777,9 @@ class _FeaturedTile extends StatelessWidget {
                     // wire value). Without an explicit pill here the
                     // featured tile would just go silent, leaving the
                     // operator wondering why the card has no action.
-                    FaiPill(
+                    ChainPill(
                       label: l.storePillComingSoon,
-                      tone: FaiPillTone.neutral,
+                      tone: ChainPillTone.neutral,
                       icon: Icons.schedule,
                     ),
                 ],
@@ -1856,23 +1856,23 @@ class _StoreCardState extends State<_StoreCard> {
         onEnter: (_) => setState(() => _hovered = true),
         onExit: (_) => setState(() => _hovered = false),
         child: AnimatedContainer(
-          duration: FaiMotion.base,
-          curve: FaiMotion.easing,
+          duration: ChainMotion.base,
+          curve: ChainMotion.easing,
           transform: Matrix4.translationValues(0, _hovered ? -2 : 0, 0),
           decoration: BoxDecoration(
-            borderRadius: BorderRadius.circular(FaiRadius.md),
+            borderRadius: BorderRadius.circular(ChainRadius.md),
             boxShadow: _hovered
-                ? FaiElevation.medium(theme.brightness)
-                : FaiElevation.low(theme.brightness),
+                ? ChainElevation.medium(theme.brightness)
+                : ChainElevation.low(theme.brightness),
           ),
           child: Material(
             color: theme.colorScheme.surfaceContainer,
-            borderRadius: BorderRadius.circular(FaiRadius.md),
+            borderRadius: BorderRadius.circular(ChainRadius.md),
             child: InkWell(
               onTap: onTap,
-              borderRadius: BorderRadius.circular(FaiRadius.md),
+              borderRadius: BorderRadius.circular(ChainRadius.md),
               child: Padding(
-                padding: const EdgeInsets.all(FaiSpace.md),
+                padding: const EdgeInsets.all(ChainSpace.md),
                 child: Column(
                   crossAxisAlignment: CrossAxisAlignment.start,
                   children: [
@@ -1889,7 +1889,7 @@ class _StoreCardState extends State<_StoreCard> {
                             color: theme.colorScheme.primary,
                           ),
                         ),
-                        const SizedBox(width: FaiSpace.sm),
+                        const SizedBox(width: ChainSpace.sm),
                         Expanded(
                           child: Column(
                             crossAxisAlignment: CrossAxisAlignment.start,
@@ -1924,26 +1924,26 @@ class _StoreCardState extends State<_StoreCard> {
                               installedVersion ?? '?',
                               item.bestVersion,
                             ),
-                            child: FaiPill(
+                            child: ChainPill(
                               label: l.storePillUpdate,
-                              tone: FaiPillTone.warning,
+                              tone: ChainPillTone.warning,
                               icon: Icons.system_update_alt,
                             ),
                           )
                         else if (item.installed)
-                          FaiPill(
+                          ChainPill(
                             label: l.storePillInstalled,
-                            tone: FaiPillTone.success,
+                            tone: ChainPillTone.success,
                             icon: Icons.check,
                           )
                         else if (item.status.isNotEmpty)
-                          FaiPill(
+                          ChainPill(
                             label: _statusDisplayName(context, item.status),
                             tone: _toneForStatus(item.status),
                           ),
                       ],
                     ),
-                    const SizedBox(height: FaiSpace.sm),
+                    const SizedBox(height: ChainSpace.sm),
                     Expanded(
                       child: Text(
                         tagline.isEmpty ? l.storeNoTagline : tagline,
@@ -1952,7 +1952,7 @@ class _StoreCardState extends State<_StoreCard> {
                         overflow: TextOverflow.ellipsis,
                       ),
                     ),
-                    const SizedBox(height: FaiSpace.sm),
+                    const SizedBox(height: ChainSpace.sm),
                     Row(
                       children: [
                         if (item.bestVersion.isNotEmpty) ...[
@@ -1960,15 +1960,15 @@ class _StoreCardState extends State<_StoreCard> {
                             message: item.isFederated
                                 ? l.storeAdvisoryVersionTooltip
                                 : '',
-                            child: FaiPill(
+                            child: ChainPill(
                               label: item.isFederated
                                   ? '~v${item.bestVersion}'
                                   : 'v${item.bestVersion}',
-                              tone: FaiPillTone.neutral,
+                              tone: ChainPillTone.neutral,
                               monospace: true,
                             ),
                           ),
-                          const SizedBox(width: FaiSpace.xs),
+                          const SizedBox(width: ChainSpace.xs),
                         ],
                         _ProvenancePill(item: item),
                         const Spacer(),
@@ -2039,7 +2039,7 @@ class _StoreDetailSheet extends StatefulWidget {
       backgroundColor: Theme.of(context).colorScheme.surfaceContainer,
       elevation: 8,
       shape: const RoundedRectangleBorder(
-        borderRadius: BorderRadius.vertical(top: Radius.circular(FaiRadius.md)),
+        borderRadius: BorderRadius.vertical(top: Radius.circular(ChainRadius.md)),
       ),
       builder: (_) => _StoreDetailSheet(item: item, locale: locale),
     );
@@ -2248,7 +2248,7 @@ class _StoreDetailSheetState extends State<_StoreDetailSheet> {
         mainAxisSize: MainAxisSize.min,
         children: [
           Padding(
-            padding: const EdgeInsets.symmetric(vertical: FaiSpace.sm),
+            padding: const EdgeInsets.symmetric(vertical: ChainSpace.sm),
             child: Container(
               width: 40,
               height: 4,
@@ -2261,10 +2261,10 @@ class _StoreDetailSheetState extends State<_StoreDetailSheet> {
           Flexible(
             child: SingleChildScrollView(
               padding: const EdgeInsets.fromLTRB(
-                FaiSpace.xxl,
-                FaiSpace.md,
-                FaiSpace.xxl,
-                FaiSpace.xxl,
+                ChainSpace.xxl,
+                ChainSpace.md,
+                ChainSpace.xxl,
+                ChainSpace.xxl,
               ),
               child: Column(
                 crossAxisAlignment: CrossAxisAlignment.start,
@@ -2278,7 +2278,7 @@ class _StoreDetailSheetState extends State<_StoreDetailSheet> {
                         category: item.category,
                         radius: 28,
                       ),
-                      const SizedBox(width: FaiSpace.lg),
+                      const SizedBox(width: ChainSpace.lg),
                       Expanded(
                         child: Column(
                           crossAxisAlignment: CrossAxisAlignment.start,
@@ -2291,7 +2291,7 @@ class _StoreDetailSheetState extends State<_StoreDetailSheet> {
                             ),
                             const SizedBox(height: 2),
                             Wrap(
-                              spacing: FaiSpace.xs,
+                              spacing: ChainSpace.xs,
                               runSpacing: 4,
                               children: [
                                 if (item.bestVersion.isNotEmpty)
@@ -2299,16 +2299,16 @@ class _StoreDetailSheetState extends State<_StoreDetailSheet> {
                                     message: item.isFederated
                                         ? l.storeAdvisoryVersionTooltip
                                         : '',
-                                    child: FaiPill(
+                                    child: ChainPill(
                                       label: item.isFederated
                                           ? '~v${item.bestVersion}'
                                           : 'v${item.bestVersion}',
-                                      tone: FaiPillTone.neutral,
+                                      tone: ChainPillTone.neutral,
                                       monospace: true,
                                     ),
                                   ),
                                 if (item.status.isNotEmpty)
-                                  FaiPill(
+                                  ChainPill(
                                     label: _statusDisplayName(
                                       context,
                                       item.status,
@@ -2316,23 +2316,23 @@ class _StoreDetailSheetState extends State<_StoreDetailSheet> {
                                     tone: _toneForStatus(item.status),
                                   ),
                                 if (item.category.isNotEmpty)
-                                  FaiPill(
+                                  ChainPill(
                                     label: _categoryDisplayName(
                                       context,
                                       item.category,
                                     ),
-                                    tone: FaiPillTone.neutral,
+                                    tone: ChainPillTone.neutral,
                                   ),
                                 if (item.installed)
-                                  FaiPill(
+                                  ChainPill(
                                     label: l.storePillInstalled,
-                                    tone: FaiPillTone.success,
+                                    tone: ChainPillTone.success,
                                     icon: Icons.check,
                                   ),
                                 if (item.license.isNotEmpty)
-                                  FaiPill(
+                                  ChainPill(
                                     label: item.license,
-                                    tone: FaiPillTone.neutral,
+                                    tone: ChainPillTone.neutral,
                                   ),
                               ],
                             ),
@@ -2344,7 +2344,7 @@ class _StoreDetailSheetState extends State<_StoreDetailSheet> {
                       // does not host its own toggle anymore.
                     ],
                   ),
-                  const SizedBox(height: FaiSpace.lg),
+                  const SizedBox(height: ChainSpace.lg),
                   if (tagline.isNotEmpty) ...[
                     Text(
                       tagline,
@@ -2352,7 +2352,7 @@ class _StoreDetailSheetState extends State<_StoreDetailSheet> {
                         color: theme.colorScheme.onSurfaceVariant,
                       ),
                     ),
-                    const SizedBox(height: FaiSpace.lg),
+                    const SizedBox(height: ChainSpace.lg),
                   ],
                   if (description.isNotEmpty) ...[
                     if (item.isFederated) ...[
@@ -2361,61 +2361,61 @@ class _StoreDetailSheetState extends State<_StoreDetailSheet> {
                       // localisation pipeline — flag it.
                       Padding(
                         padding: const EdgeInsets.only(bottom: 6),
-                        child: FaiEnBadge.forContext(context),
+                        child: ChainEnBadge.forContext(context),
                       ),
                     ],
                     SelectableText(
                       description,
                       style: theme.textTheme.bodyMedium,
                     ),
-                    const SizedBox(height: FaiSpace.xl),
+                    const SizedBox(height: ChainSpace.xl),
                   ],
                   if (item.tags.isNotEmpty) ...[
                     _SectionHeader(l.storeSectionTags),
-                    const SizedBox(height: FaiSpace.sm),
+                    const SizedBox(height: ChainSpace.sm),
                     Wrap(
-                      spacing: FaiSpace.xs,
-                      runSpacing: FaiSpace.xs,
+                      spacing: ChainSpace.xs,
+                      runSpacing: ChainSpace.xs,
                       children: [
                         for (final t in item.tags)
-                          FaiPill(label: t, tone: FaiPillTone.neutral),
+                          ChainPill(label: t, tone: ChainPillTone.neutral),
                       ],
                     ),
-                    const SizedBox(height: FaiSpace.lg),
+                    const SizedBox(height: ChainSpace.lg),
                   ],
                   if (item.requiresCapabilities.isNotEmpty) ...[
                     _SectionHeader(l.storeSectionRequiredCapabilities),
-                    const SizedBox(height: FaiSpace.sm),
+                    const SizedBox(height: ChainSpace.sm),
                     Wrap(
-                      spacing: FaiSpace.xs,
-                      runSpacing: FaiSpace.xs,
+                      spacing: ChainSpace.xs,
+                      runSpacing: ChainSpace.xs,
                       children: [
                         for (final c in item.requiresCapabilities)
-                          FaiPill(
+                          ChainPill(
                             label: c,
-                            tone: FaiPillTone.accent,
+                            tone: ChainPillTone.accent,
                             monospace: true,
                           ),
                       ],
                     ),
-                    const SizedBox(height: FaiSpace.lg),
+                    const SizedBox(height: ChainSpace.lg),
                   ],
                   if (item.requiresServices.isNotEmpty) ...[
                     _SectionHeader(l.storeSectionRequiredHostServices),
-                    const SizedBox(height: FaiSpace.sm),
+                    const SizedBox(height: ChainSpace.sm),
                     Wrap(
-                      spacing: FaiSpace.xs,
-                      runSpacing: FaiSpace.xs,
+                      spacing: ChainSpace.xs,
+                      runSpacing: ChainSpace.xs,
                       children: [
                         for (final s in item.requiresServices)
-                          FaiPill(
+                          ChainPill(
                             label: s,
-                            tone: FaiPillTone.warning,
+                            tone: ChainPillTone.warning,
                             monospace: true,
                           ),
                       ],
                     ),
-                    const SizedBox(height: FaiSpace.lg),
+                    const SizedBox(height: ChainSpace.lg),
                   ],
                   // Live-from-hub sections for installed
                   // modules. Folded in here in v0.35.0 when the
@@ -2426,7 +2426,7 @@ class _StoreDetailSheetState extends State<_StoreDetailSheet> {
                   // about a module.
                   if (item.installed && _moduleDetail != null) ...[
                     _SectionHeader(l.storeSectionPermissions),
-                    const SizedBox(height: FaiSpace.sm),
+                    const SizedBox(height: ChainSpace.sm),
                     if (_moduleDetail!.permissions.isEmpty)
                       Text(
                         l.storeSectionPermissionsNone,
@@ -2449,10 +2449,10 @@ class _StoreDetailSheetState extends State<_StoreDetailSheet> {
                                     size: 14,
                                     color: theme.colorScheme.onSurfaceVariant,
                                   ),
-                                  const SizedBox(width: FaiSpace.sm),
+                                  const SizedBox(width: ChainSpace.sm),
                                   SelectableText(
                                     p,
-                                    style: FaiTheme.mono(
+                                    style: ChainTheme.mono(
                                       size: 12,
                                       color: theme.colorScheme.onSurface,
                                     ),
@@ -2462,53 +2462,53 @@ class _StoreDetailSheetState extends State<_StoreDetailSheet> {
                             ),
                         ],
                       ),
-                    const SizedBox(height: FaiSpace.lg),
+                    const SizedBox(height: ChainSpace.lg),
                     _SectionHeader(l.storeSectionDirectory),
-                    const SizedBox(height: FaiSpace.sm),
+                    const SizedBox(height: ChainSpace.sm),
                     SelectableText(
                       _moduleDetail!.directory,
-                      style: FaiTheme.mono(
+                      style: ChainTheme.mono(
                         size: 11,
                         color: theme.colorScheme.onSurfaceVariant,
                       ),
                     ),
-                    const SizedBox(height: FaiSpace.lg),
+                    const SizedBox(height: ChainSpace.lg),
                   ],
                   if (item.screenshotUrls.isNotEmpty) ...[
                     _SectionHeader(l.storeSectionScreenshots),
-                    const SizedBox(height: FaiSpace.sm),
+                    const SizedBox(height: ChainSpace.sm),
                     SizedBox(
                       height: 220,
                       child: ListView.separated(
                         scrollDirection: Axis.horizontal,
                         itemCount: item.screenshotUrls.length,
                         separatorBuilder: (_, _) =>
-                            const SizedBox(width: FaiSpace.sm),
+                            const SizedBox(width: ChainSpace.sm),
                         itemBuilder: (context, i) =>
                             _Screenshot(url: item.screenshotUrls[i]),
                       ),
                     ),
-                    const SizedBox(height: FaiSpace.lg),
+                    const SizedBox(height: ChainSpace.lg),
                   ],
                   if (_docsResult?.state == 'found') ...[
                     _SectionHeader(l.storeSectionDocumentation),
-                    const SizedBox(height: FaiSpace.sm),
+                    const SizedBox(height: ChainSpace.sm),
                     _DocsPanel(text: _docsResult!.text),
-                    const SizedBox(height: FaiSpace.lg),
+                    const SizedBox(height: ChainSpace.lg),
                   ],
                   if (item.repository.isNotEmpty) ...[
                     _SectionHeader(l.storeSectionSource),
-                    const SizedBox(height: FaiSpace.sm),
+                    const SizedBox(height: ChainSpace.sm),
                     InkWell(
                       onTap: _openRepository,
                       child: Row(
                         children: [
                           const Icon(Icons.open_in_new, size: 14),
-                          const SizedBox(width: FaiSpace.xs),
+                          const SizedBox(width: ChainSpace.xs),
                           Flexible(
                             child: Text(
                               item.repository,
-                              style: FaiTheme.mono(
+                              style: ChainTheme.mono(
                                 size: 11,
                                 color: theme.colorScheme.primary,
                               ),
@@ -2518,24 +2518,24 @@ class _StoreDetailSheetState extends State<_StoreDetailSheet> {
                         ],
                       ),
                     ),
-                    const SizedBox(height: FaiSpace.lg),
+                    const SizedBox(height: ChainSpace.lg),
                   ],
                   if (_toast != null) ...[
                     Container(
-                      padding: const EdgeInsets.all(FaiSpace.sm),
+                      padding: const EdgeInsets.all(ChainSpace.sm),
                       decoration: BoxDecoration(
                         color: theme.colorScheme.surfaceContainerHigh,
-                        borderRadius: BorderRadius.circular(FaiRadius.sm),
+                        borderRadius: BorderRadius.circular(ChainRadius.sm),
                         border: Border.all(
                           color: theme.colorScheme.outlineVariant,
                         ),
                       ),
                       child: SelectableText(
                         _toast!,
-                        style: FaiTheme.mono(size: 11),
+                        style: ChainTheme.mono(size: 11),
                       ),
                     ),
-                    const SizedBox(height: FaiSpace.md),
+                    const SizedBox(height: ChainSpace.md),
                   ],
                   Row(
                     children: [
@@ -2585,12 +2585,12 @@ class _StoreDetailSheetState extends State<_StoreDetailSheet> {
                         Expanded(
                           child: Container(
                             padding: const EdgeInsets.symmetric(
-                              horizontal: FaiSpace.md,
-                              vertical: FaiSpace.sm,
+                              horizontal: ChainSpace.md,
+                              vertical: ChainSpace.sm,
                             ),
                             decoration: BoxDecoration(
                               color: theme.colorScheme.surfaceContainer,
-                              borderRadius: BorderRadius.circular(FaiRadius.sm),
+                              borderRadius: BorderRadius.circular(ChainRadius.sm),
                               border: Border.all(
                                 color: theme.colorScheme.outlineVariant,
                               ),
@@ -2602,7 +2602,7 @@ class _StoreDetailSheetState extends State<_StoreDetailSheet> {
                                   size: 16,
                                   color: theme.colorScheme.onSurfaceVariant,
                                 ),
-                                const SizedBox(width: FaiSpace.sm),
+                                const SizedBox(width: ChainSpace.sm),
                                 Expanded(
                                   child: Text(
                                     l.storeNotInstallableInline(item.status),
@@ -2674,7 +2674,7 @@ class _InstallProgressDialogState extends State<_InstallProgressDialog> {
     return AlertDialog(
       title: Text(l.storeInstallProgressTitle(widget.item.name)),
       shape: RoundedRectangleBorder(
-        borderRadius: BorderRadius.circular(FaiRadius.md),
+        borderRadius: BorderRadius.circular(ChainRadius.md),
       ),
       content: ConstrainedBox(
         constraints: const BoxConstraints(maxWidth: 480, maxHeight: 360),
@@ -2685,9 +2685,9 @@ class _InstallProgressDialogState extends State<_InstallProgressDialog> {
               return Column(
                 mainAxisSize: MainAxisSize.min,
                 children: [
-                  const SizedBox(height: FaiSpace.md),
+                  const SizedBox(height: ChainSpace.md),
                   const CircularProgressIndicator(),
-                  const SizedBox(height: FaiSpace.md),
+                  const SizedBox(height: ChainSpace.md),
                   Text(
                     l.storeInstallProgressBody,
                     style: theme.textTheme.bodySmall?.copyWith(
@@ -2708,8 +2708,8 @@ class _InstallProgressDialogState extends State<_InstallProgressDialog> {
                       color: theme.colorScheme.error,
                       size: 32,
                     ),
-                    const SizedBox(height: FaiSpace.md),
-                    FaiErrorBox(
+                    const SizedBox(height: ChainSpace.md),
+                    ChainErrorBox(
                       error: snap.error,
                       isError: true,
                       maxHeight: 200,
@@ -2725,9 +2725,9 @@ class _InstallProgressDialogState extends State<_InstallProgressDialog> {
                 Icon(
                   Icons.check_circle_outline,
                   size: 32,
-                  color: FaiColors.success,
+                  color: ChainColors.success,
                 ),
-                const SizedBox(height: FaiSpace.md),
+                const SizedBox(height: ChainSpace.md),
                 Text(
                   l.storeInstalledToast(r.name, r.version),
                   style: theme.textTheme.titleMedium,
@@ -2747,16 +2747,16 @@ class _InstallProgressDialogState extends State<_InstallProgressDialog> {
   }
 }
 
-FaiPillTone _toneForStatus(String s) {
+ChainPillTone _toneForStatus(String s) {
   switch (s) {
     case 'published':
-      return FaiPillTone.success;
+      return ChainPillTone.success;
     case 'alpha':
-      return FaiPillTone.warning;
+      return ChainPillTone.warning;
     case 'planned':
-      return FaiPillTone.neutral;
+      return ChainPillTone.neutral;
     default:
-      return FaiPillTone.neutral;
+      return ChainPillTone.neutral;
   }
 }
 
@@ -2807,10 +2807,10 @@ class _DocsPanel extends StatelessWidget {
     // scrollbars fighting for the wheel.
     return Container(
       width: double.infinity,
-      padding: const EdgeInsets.all(FaiSpace.md),
+      padding: const EdgeInsets.all(ChainSpace.md),
       decoration: BoxDecoration(
         color: theme.colorScheme.surfaceContainerHigh,
-        borderRadius: BorderRadius.circular(FaiRadius.sm),
+        borderRadius: BorderRadius.circular(ChainRadius.sm),
         border: Border.all(color: theme.colorScheme.outlineVariant),
       ),
       child: Markdown(
@@ -2822,7 +2822,7 @@ class _DocsPanel extends StatelessWidget {
           if (href == null || href.isEmpty) return;
           await SystemActions.openInOs(href);
         },
-        styleSheet: FaiTheme.markdownStyle(theme),
+        styleSheet: ChainTheme.markdownStyle(theme),
       ),
     );
   }
@@ -2912,12 +2912,12 @@ class _Screenshot extends StatelessWidget {
     final theme = Theme.of(context);
     return Material(
       color: theme.colorScheme.surfaceContainerHigh,
-      borderRadius: BorderRadius.circular(FaiRadius.sm),
+      borderRadius: BorderRadius.circular(ChainRadius.sm),
       child: InkWell(
         onTap: () => SystemActions.openInOs(url),
-        borderRadius: BorderRadius.circular(FaiRadius.sm),
+        borderRadius: BorderRadius.circular(ChainRadius.sm),
         child: ClipRRect(
-          borderRadius: BorderRadius.circular(FaiRadius.sm),
+          borderRadius: BorderRadius.circular(ChainRadius.sm),
           child: SizedBox(
             width: 320,
             child: Image.network(
@@ -2954,7 +2954,7 @@ class _ScreenshotPlaceholder extends StatelessWidget {
       color: theme.colorScheme.surfaceContainer,
       child: Center(
         child: Padding(
-          padding: const EdgeInsets.all(FaiSpace.md),
+          padding: const EdgeInsets.all(ChainSpace.md),
           child: Column(
             mainAxisSize: MainAxisSize.min,
             children: [
@@ -2974,7 +2974,7 @@ class _ScreenshotPlaceholder extends StatelessWidget {
                 const SizedBox(height: 2),
                 Text(
                   detail,
-                  style: FaiTheme.mono(
+                  style: ChainTheme.mono(
                     size: 9,
                     color: theme.colorScheme.onSurfaceVariant,
                   ),
@@ -3186,13 +3186,13 @@ class _StoreTodayHero extends StatelessWidget {
       // row) without leaving empty space on shorter slides.
       constraints: const BoxConstraints(minHeight: 240),
       padding: const EdgeInsets.fromLTRB(
-        FaiSpace.xl,
-        FaiSpace.lg,
-        FaiSpace.md,
-        FaiSpace.lg,
+        ChainSpace.xl,
+        ChainSpace.lg,
+        ChainSpace.md,
+        ChainSpace.lg,
       ),
       decoration: BoxDecoration(
-        borderRadius: BorderRadius.circular(FaiRadius.md),
+        borderRadius: BorderRadius.circular(ChainRadius.md),
         gradient: LinearGradient(
           colors: [
             theme.colorScheme.primary.withValues(alpha: 0.16),
@@ -3211,24 +3211,24 @@ class _StoreTodayHero extends StatelessWidget {
         crossAxisAlignment: CrossAxisAlignment.start,
         children: [
           Container(
-            padding: const EdgeInsets.all(FaiSpace.md),
+            padding: const EdgeInsets.all(ChainSpace.md),
             decoration: BoxDecoration(
               color: theme.colorScheme.primary.withValues(alpha: 0.14),
               shape: BoxShape.circle,
             ),
             child: Icon(story.icon, size: 24, color: theme.colorScheme.primary),
           ),
-          const SizedBox(width: FaiSpace.lg),
+          const SizedBox(width: ChainSpace.lg),
           Expanded(
             child: Column(
               crossAxisAlignment: CrossAxisAlignment.start,
               children: [
                 Wrap(
-                  spacing: FaiSpace.sm,
+                  spacing: ChainSpace.sm,
                   runSpacing: 4,
                   crossAxisAlignment: WrapCrossAlignment.center,
                   children: [
-                    FaiPill(label: l.storeTodayBadge, tone: FaiPillTone.accent),
+                    ChainPill(label: l.storeTodayBadge, tone: ChainPillTone.accent),
                     Text(
                       badge,
                       style: theme.textTheme.labelSmall?.copyWith(
@@ -3247,7 +3247,7 @@ class _StoreTodayHero extends StatelessWidget {
                     ),
                   ],
                 ),
-                const SizedBox(height: FaiSpace.sm),
+                const SizedBox(height: ChainSpace.sm),
                 Text(
                   title,
                   maxLines: 3,
@@ -3257,7 +3257,7 @@ class _StoreTodayHero extends StatelessWidget {
                     height: 1.15,
                   ),
                 ),
-                const SizedBox(height: FaiSpace.sm),
+                const SizedBox(height: ChainSpace.sm),
                 Text(
                   body,
                   maxLines: 6,
@@ -3268,10 +3268,10 @@ class _StoreTodayHero extends StatelessWidget {
                   ),
                 ),
                 if (onCta != null || recommendedSources.isNotEmpty) ...[
-                  const SizedBox(height: FaiSpace.md),
+                  const SizedBox(height: ChainSpace.md),
                   Wrap(
-                    spacing: FaiSpace.sm,
-                    runSpacing: FaiSpace.xs,
+                    spacing: ChainSpace.sm,
+                    runSpacing: ChainSpace.xs,
                     crossAxisAlignment: WrapCrossAlignment.center,
                     children: [
                       if (onCta != null)
@@ -3321,7 +3321,7 @@ class _StoreTodayHero extends StatelessWidget {
                 onPressed: onDismiss,
               ),
               if (totalCount > 1) ...[
-                const SizedBox(height: FaiSpace.sm),
+                const SizedBox(height: ChainSpace.sm),
                 Row(
                   mainAxisSize: MainAxisSize.min,
                   children: [
@@ -3443,10 +3443,10 @@ class _RecommendedSourcesStrip extends StatelessWidget {
     final l = AppLocalizations.of(context)!;
     return Container(
       width: double.infinity,
-      padding: const EdgeInsets.all(FaiSpace.md),
+      padding: const EdgeInsets.all(ChainSpace.md),
       decoration: BoxDecoration(
         color: theme.colorScheme.surfaceContainer,
-        borderRadius: BorderRadius.circular(FaiRadius.md),
+        borderRadius: BorderRadius.circular(ChainRadius.md),
         border: Border.all(color: theme.colorScheme.outlineVariant),
       ),
       child: Column(
@@ -3459,7 +3459,7 @@ class _RecommendedSourcesStrip extends StatelessWidget {
                 size: 18,
                 color: theme.colorScheme.primary,
               ),
-              const SizedBox(width: FaiSpace.sm),
+              const SizedBox(width: ChainSpace.sm),
               Text(
                 l.storeRecommendedTitle,
                 style: theme.textTheme.titleSmall?.copyWith(
@@ -3475,10 +3475,10 @@ class _RecommendedSourcesStrip extends StatelessWidget {
               color: theme.colorScheme.onSurfaceVariant,
             ),
           ),
-          const SizedBox(height: FaiSpace.md),
+          const SizedBox(height: ChainSpace.md),
           Wrap(
-            spacing: FaiSpace.md,
-            runSpacing: FaiSpace.sm,
+            spacing: ChainSpace.md,
+            runSpacing: ChainSpace.sm,
             children: [
               for (final s in _kRecommendedSources)
                 _RecommendedSourceCard(
@@ -3516,16 +3516,16 @@ class _RecommendedSourceCard extends StatelessWidget {
     return SizedBox(
       width: 320,
       child: Container(
-        padding: const EdgeInsets.all(FaiSpace.sm),
+        padding: const EdgeInsets.all(ChainSpace.sm),
         decoration: BoxDecoration(
           color: theme.colorScheme.surfaceContainerHigh,
-          borderRadius: BorderRadius.circular(FaiRadius.sm),
+          borderRadius: BorderRadius.circular(ChainRadius.sm),
           border: Border.all(color: theme.colorScheme.outlineVariant),
         ),
         child: Row(
           children: [
             Icon(source.icon, size: 18, color: theme.colorScheme.primary),
-            const SizedBox(width: FaiSpace.sm),
+            const SizedBox(width: ChainSpace.sm),
             Expanded(
               child: Column(
                 crossAxisAlignment: CrossAxisAlignment.start,
@@ -3549,7 +3549,7 @@ class _RecommendedSourceCard extends StatelessWidget {
                 ],
               ),
             ),
-            const SizedBox(width: FaiSpace.sm),
+            const SizedBox(width: ChainSpace.sm),
             Tooltip(
               message: busy
                   ? l.storeRecommendedAdding
@@ -3589,23 +3589,23 @@ class _ProvenancePill extends StatelessWidget {
     final source = _sourceForItem(item);
     switch (source) {
       case 'mcp':
-        return FaiPill(
+        return ChainPill(
           label: l.storeProvenanceMcp(item.provider),
-          tone: FaiPillTone.warning,
+          tone: ChainPillTone.warning,
           monospace: true,
           icon: Icons.hub_outlined,
         );
       case 'n8n':
-        return FaiPill(
+        return ChainPill(
           label: l.storeProvenanceN8n(item.provider),
-          tone: FaiPillTone.accent,
+          tone: ChainPillTone.accent,
           monospace: true,
           icon: Icons.account_tree_outlined,
         );
       case 'temporal':
-        return FaiPill(
+        return ChainPill(
           label: l.storeProvenanceTemporal(item.provider),
-          tone: FaiPillTone.accent,
+          tone: ChainPillTone.accent,
           monospace: true,
           icon: Icons.timer_outlined,
         );
@@ -3658,7 +3658,7 @@ class _StoreUninstallVersionPickerDialogState
         mainAxisSize: MainAxisSize.min,
         children: [
           Text(l.uninstallVersionPickerBody(widget.moduleName)),
-          const SizedBox(height: FaiSpace.md),
+          const SizedBox(height: ChainSpace.md),
           RadioGroup<String>(
             groupValue: _picked,
             onChanged: (val) {
diff --git a/lib/pages/welcome.dart b/lib/pages/welcome.dart
index 8262f5a..14dd4f2 100644
--- a/lib/pages/welcome.dart
+++ b/lib/pages/welcome.dart
@@ -35,14 +35,14 @@ class WelcomePage extends StatelessWidget {
     final hubDown = StudioShellState.of(context)?.connected == false;
     return Scaffold(
       backgroundColor: theme.scaffoldBackgroundColor,
-      appBar: AppBar(titleSpacing: FaiSpace.xl, title: Text(l.navWelcome)),
+      appBar: AppBar(titleSpacing: ChainSpace.xl, title: Text(l.navWelcome)),
       body: SingleChildScrollView(
         child: Padding(
           padding: const EdgeInsets.fromLTRB(
-            FaiSpace.xl,
-            FaiSpace.lg,
-            FaiSpace.xl,
-            FaiSpace.xxl,
+            ChainSpace.xl,
+            ChainSpace.lg,
+            ChainSpace.xl,
+            ChainSpace.xxl,
           ),
           // Center the 960-px content column on wide windows
           // so the right margin matches the left rather than
@@ -59,24 +59,24 @@ class WelcomePage extends StatelessWidget {
                 crossAxisAlignment: CrossAxisAlignment.start,
                 children: [
                   const _Hero(),
-                  const SizedBox(height: FaiSpace.xxl),
+                  const SizedBox(height: ChainSpace.xxl),
                   // When the hub is down the onboarding checklist
                   // would render dead (all-unchecked, nothing to
                   // probe). Lead with a "start the hub" card
                   // instead; restore the checklist once connected.
                   if (hubDown) ...[
                     const _HubDownHero(),
-                    const SizedBox(height: FaiSpace.xxl),
+                    const SizedBox(height: ChainSpace.xxl),
                   ] else
                     const _OnboardingChecklist(),
                   const _PillarRow(),
-                  const SizedBox(height: FaiSpace.xxl),
+                  const SizedBox(height: ChainSpace.xxl),
                   const _SectionLabel(textKey: _SectionLabelKey.trust),
-                  const SizedBox(height: FaiSpace.md),
+                  const SizedBox(height: ChainSpace.md),
                   const _TrustPosture(),
-                  const SizedBox(height: FaiSpace.xxl),
+                  const SizedBox(height: ChainSpace.xxl),
                   const _SectionLabel(textKey: _SectionLabelKey.docs),
-                  const SizedBox(height: FaiSpace.md),
+                  const SizedBox(height: ChainSpace.md),
                   const _DocsRow(),
                 ],
               ),
@@ -100,9 +100,9 @@ class _Hero extends StatelessWidget {
     final l = AppLocalizations.of(context)!;
     return Container(
       width: double.infinity,
-      padding: const EdgeInsets.all(FaiSpace.xxl),
+      padding: const EdgeInsets.all(ChainSpace.xxl),
       decoration: BoxDecoration(
-        borderRadius: BorderRadius.circular(FaiRadius.md),
+        borderRadius: BorderRadius.circular(ChainRadius.md),
         gradient: LinearGradient(
           colors: [
             theme.colorScheme.primary.withValues(alpha: 0.18),
@@ -123,7 +123,7 @@ class _Hero extends StatelessWidget {
           Row(
             children: [
               Container(
-                padding: const EdgeInsets.all(FaiSpace.md),
+                padding: const EdgeInsets.all(ChainSpace.md),
                 decoration: BoxDecoration(
                   color: theme.colorScheme.primary.withValues(alpha: 0.14),
                   shape: BoxShape.circle,
@@ -134,7 +134,7 @@ class _Hero extends StatelessWidget {
                   color: theme.colorScheme.primary,
                 ),
               ),
-              const SizedBox(width: FaiSpace.lg),
+              const SizedBox(width: ChainSpace.lg),
               Expanded(
                 child: Text(
                   l.welcomeHeroTitle,
@@ -145,7 +145,7 @@ class _Hero extends StatelessWidget {
               ),
             ],
           ),
-          const SizedBox(height: FaiSpace.lg),
+          const SizedBox(height: ChainSpace.lg),
           Text(
             l.welcomeHeroSubtitle,
             style: theme.textTheme.titleMedium?.copyWith(
@@ -189,13 +189,13 @@ class _HubDownHeroState extends State<_HubDownHero> {
     final l = AppLocalizations.of(context)!;
     // No `fai` binary → "Start hub" cannot work; lead the
     // operator to the install guide instead.
-    final canStart = SystemActions.faiBinaryExists();
+    final canStart = SystemActions.chainBinaryExists();
     return Container(
       width: double.infinity,
-      padding: const EdgeInsets.all(FaiSpace.xl),
+      padding: const EdgeInsets.all(ChainSpace.xl),
       decoration: BoxDecoration(
         color: theme.colorScheme.errorContainer.withValues(alpha: 0.35),
-        borderRadius: BorderRadius.circular(FaiRadius.md),
+        borderRadius: BorderRadius.circular(ChainRadius.md),
         border: Border.all(
           color: theme.colorScheme.error.withValues(alpha: 0.4),
         ),
@@ -210,7 +210,7 @@ class _HubDownHeroState extends State<_HubDownHero> {
                 size: 24,
                 color: theme.colorScheme.error,
               ),
-              const SizedBox(width: FaiSpace.md),
+              const SizedBox(width: ChainSpace.md),
               Expanded(
                 child: Text(
                   l.welcomeHubDownTitle,
@@ -221,7 +221,7 @@ class _HubDownHeroState extends State<_HubDownHero> {
               ),
             ],
           ),
-          const SizedBox(height: FaiSpace.md),
+          const SizedBox(height: ChainSpace.md),
           Text(
             l.welcomeHubDownBody,
             style: theme.textTheme.bodyMedium?.copyWith(
@@ -229,15 +229,15 @@ class _HubDownHeroState extends State<_HubDownHero> {
               height: 1.45,
             ),
           ),
-          const SizedBox(height: FaiSpace.xs),
+          const SizedBox(height: ChainSpace.xs),
           Text(
             l.welcomeHubDownEndpoint(HubService.instance.endpointLabel),
-            style: FaiTheme.mono(
+            style: ChainTheme.mono(
               size: 11,
               color: theme.colorScheme.onSurfaceVariant,
             ),
           ),
-          const SizedBox(height: FaiSpace.lg),
+          const SizedBox(height: ChainSpace.lg),
           if (canStart)
             FilledButton.icon(
               onPressed: _starting ? null : _start,
@@ -253,8 +253,8 @@ class _HubDownHeroState extends State<_HubDownHero> {
               ),
             )
           else
-            const FaiBinaryRecovery(),
-          const SizedBox(height: FaiSpace.sm),
+            const ChainBinaryRecovery(),
+          const SizedBox(height: ChainSpace.sm),
           TextButton.icon(
             icon: const Icon(Icons.open_in_new, size: 16),
             label: Text(l.welcomeHubDownDocsLink),
@@ -323,7 +323,7 @@ class _PillarRow extends StatelessWidget {
             children: [
               for (final p in pillars) ...[
                 _Pillar(icon: p.$1, title: p.$2, body: p.$3),
-                const SizedBox(height: FaiSpace.md),
+                const SizedBox(height: ChainSpace.md),
               ],
             ],
           );
@@ -339,7 +339,7 @@ class _PillarRow extends StatelessWidget {
             crossAxisAlignment: CrossAxisAlignment.stretch,
             children: [
               for (var i = 0; i < pillars.length; i++) ...[
-                if (i > 0) const SizedBox(width: FaiSpace.md),
+                if (i > 0) const SizedBox(width: ChainSpace.md),
                 Expanded(
                   child: _Pillar(
                     icon: pillars[i].$1,
@@ -367,24 +367,24 @@ class _Pillar extends StatelessWidget {
   Widget build(BuildContext context) {
     final theme = Theme.of(context);
     return Container(
-      padding: const EdgeInsets.all(FaiSpace.lg),
+      padding: const EdgeInsets.all(ChainSpace.lg),
       decoration: BoxDecoration(
         color: theme.colorScheme.surfaceContainer,
-        borderRadius: BorderRadius.circular(FaiRadius.md),
+        borderRadius: BorderRadius.circular(ChainRadius.md),
         border: Border.all(color: theme.colorScheme.outlineVariant),
       ),
       child: Column(
         crossAxisAlignment: CrossAxisAlignment.start,
         children: [
           Icon(icon, size: 28, color: theme.colorScheme.primary),
-          const SizedBox(height: FaiSpace.md),
+          const SizedBox(height: ChainSpace.md),
           Text(
             title,
             style: theme.textTheme.titleLarge?.copyWith(
               fontWeight: FontWeight.w700,
             ),
           ),
-          const SizedBox(height: FaiSpace.sm),
+          const SizedBox(height: ChainSpace.sm),
           Text(
             body,
             style: theme.textTheme.bodyMedium?.copyWith(
@@ -427,7 +427,7 @@ class _TrustPosture extends StatelessWidget {
     return Column(
       children: [
         for (var i = 0; i < rows.length; i++) ...[
-          if (i > 0) const SizedBox(height: FaiSpace.sm),
+          if (i > 0) const SizedBox(height: ChainSpace.sm),
           _TrustRow(icon: rows[i].$1, title: rows[i].$2, body: rows[i].$3),
         ],
       ],
@@ -450,17 +450,17 @@ class _TrustRow extends StatelessWidget {
   Widget build(BuildContext context) {
     final theme = Theme.of(context);
     return Container(
-      padding: const EdgeInsets.all(FaiSpace.lg),
+      padding: const EdgeInsets.all(ChainSpace.lg),
       decoration: BoxDecoration(
         color: theme.colorScheme.surfaceContainer,
-        borderRadius: BorderRadius.circular(FaiRadius.md),
+        borderRadius: BorderRadius.circular(ChainRadius.md),
         border: Border.all(color: theme.colorScheme.outlineVariant),
       ),
       child: Row(
         crossAxisAlignment: CrossAxisAlignment.start,
         children: [
           Icon(icon, size: 22, color: theme.colorScheme.primary),
-          const SizedBox(width: FaiSpace.lg),
+          const SizedBox(width: ChainSpace.lg),
           Expanded(
             child: Column(
               crossAxisAlignment: CrossAxisAlignment.start,
@@ -601,13 +601,13 @@ class _OnboardingChecklistState extends State<_OnboardingChecklist> {
         _aiOk,
         l.welcomeChecklistAi,
         l.welcomeChecklistAiHint,
-        () => FaiSettingsDialog.show(context),
+        () => ChainSettingsDialog.show(context),
       ),
       (
         _mcpOk,
         l.welcomeChecklistMcp,
         l.welcomeChecklistMcpHint,
-        () => FaiSettingsDialog.show(context),
+        () => ChainSettingsDialog.show(context),
       ),
       (
         _moduleOk,
@@ -623,7 +623,7 @@ class _OnboardingChecklistState extends State<_OnboardingChecklist> {
       ),
     ];
     return Padding(
-      padding: const EdgeInsets.only(bottom: FaiSpace.xxl),
+      padding: const EdgeInsets.only(bottom: ChainSpace.xxl),
       child: Column(
         crossAxisAlignment: CrossAxisAlignment.start,
         children: [
@@ -661,11 +661,11 @@ class _OnboardingChecklistState extends State<_OnboardingChecklist> {
               color: theme.colorScheme.onSurfaceVariant,
             ),
           ),
-          const SizedBox(height: FaiSpace.md),
+          const SizedBox(height: ChainSpace.md),
           Container(
             decoration: BoxDecoration(
               color: theme.colorScheme.surfaceContainer,
-              borderRadius: BorderRadius.circular(FaiRadius.md),
+              borderRadius: BorderRadius.circular(ChainRadius.md),
               border: Border.all(color: theme.colorScheme.outlineVariant),
             ),
             child: Column(
@@ -684,7 +684,7 @@ class _OnboardingChecklistState extends State<_OnboardingChecklist> {
             ),
           ),
           if (allDone) ...[
-            const SizedBox(height: FaiSpace.md),
+            const SizedBox(height: ChainSpace.md),
             _AllDoneCelebration(onDismiss: _dismiss),
           ],
         ],
@@ -707,19 +707,19 @@ class _AllDoneCelebration extends StatelessWidget {
     final theme = Theme.of(context);
     final l = AppLocalizations.of(context)!;
     return Container(
-      padding: const EdgeInsets.all(FaiSpace.lg),
+      padding: const EdgeInsets.all(ChainSpace.lg),
       decoration: BoxDecoration(
-        color: FaiColors.success.withValues(alpha: 0.08),
-        borderRadius: BorderRadius.circular(FaiRadius.md),
-        border: Border.all(color: FaiColors.success.withValues(alpha: 0.35)),
+        color: ChainColors.success.withValues(alpha: 0.08),
+        borderRadius: BorderRadius.circular(ChainRadius.md),
+        border: Border.all(color: ChainColors.success.withValues(alpha: 0.35)),
       ),
       child: Column(
         crossAxisAlignment: CrossAxisAlignment.start,
         children: [
           Row(
             children: [
-              Icon(Icons.celebration_outlined, color: FaiColors.success),
-              const SizedBox(width: FaiSpace.sm),
+              Icon(Icons.celebration_outlined, color: ChainColors.success),
+              const SizedBox(width: ChainSpace.sm),
               Expanded(
                 child: Text(
                   l.welcomeChecklistAllSetTitle,
@@ -741,7 +741,7 @@ class _AllDoneCelebration extends StatelessWidget {
               color: theme.colorScheme.onSurfaceVariant,
             ),
           ),
-          const SizedBox(height: FaiSpace.md),
+          const SizedBox(height: ChainSpace.md),
           _NextStepRow(
             icon: Icons.timeline_outlined,
             title: l.welcomeChecklistNextAuditTitle,
@@ -797,12 +797,12 @@ class _NextStepRow extends StatelessWidget {
     final theme = Theme.of(context);
     final canActivate = doc != null && onOpenDoc != null;
     return Padding(
-      padding: const EdgeInsets.only(bottom: FaiSpace.sm),
+      padding: const EdgeInsets.only(bottom: ChainSpace.sm),
       child: Row(
         crossAxisAlignment: CrossAxisAlignment.start,
         children: [
           Icon(icon, size: 18, color: theme.colorScheme.primary),
-          const SizedBox(width: FaiSpace.md),
+          const SizedBox(width: ChainSpace.md),
           Expanded(
             child: Column(
               crossAxisAlignment: CrossAxisAlignment.start,
@@ -823,7 +823,7 @@ class _NextStepRow extends StatelessWidget {
               ],
             ),
           ),
-          const SizedBox(width: FaiSpace.md),
+          const SizedBox(width: ChainSpace.md),
           OutlinedButton(
             onPressed: canActivate ? () => onOpenDoc!(doc!) : null,
             child: Text(buttonLabel),
@@ -856,16 +856,16 @@ class _ChecklistRow extends StatelessWidget {
     final theme = Theme.of(context);
     final l = AppLocalizations.of(context)!;
     final row = Padding(
-      padding: const EdgeInsets.all(FaiSpace.lg),
+      padding: const EdgeInsets.all(ChainSpace.lg),
       child: Row(
         crossAxisAlignment: CrossAxisAlignment.start,
         children: [
           Icon(
             done ? Icons.check_circle : Icons.radio_button_unchecked,
             size: 20,
-            color: done ? FaiColors.success : theme.colorScheme.outline,
+            color: done ? ChainColors.success : theme.colorScheme.outline,
           ),
-          const SizedBox(width: FaiSpace.lg),
+          const SizedBox(width: ChainSpace.lg),
           Expanded(
             child: Column(
               crossAxisAlignment: CrossAxisAlignment.start,
@@ -890,10 +890,10 @@ class _ChecklistRow extends StatelessWidget {
               ],
             ),
           ),
-          const SizedBox(width: FaiSpace.md),
-          FaiPill(
+          const SizedBox(width: ChainSpace.md),
+          ChainPill(
             label: done ? l.welcomeChecklistDone : l.welcomeChecklistTodo,
-            tone: done ? FaiPillTone.success : FaiPillTone.neutral,
+            tone: done ? ChainPillTone.success : ChainPillTone.neutral,
           ),
         ],
       ),
@@ -985,7 +985,7 @@ class _DocsRow extends StatelessWidget {
             color: Theme.of(context).colorScheme.onSurfaceVariant,
           ),
         ),
-        const SizedBox(height: FaiSpace.md),
+        const SizedBox(height: ChainSpace.md),
         LayoutBuilder(
           builder: (context, constraints) {
             final twoCols = constraints.maxWidth >= 640;
@@ -997,16 +997,16 @@ class _DocsRow extends StatelessWidget {
               return Column(
                 children: [
                   for (var i = 0; i < _kDocs.length; i++) ...[
-                    if (i > 0) const SizedBox(height: FaiSpace.md),
+                    if (i > 0) const SizedBox(height: ChainSpace.md),
                     _DocCard(entry: _kDocs[i]),
                   ],
                 ],
               );
             }
-            final cardWidth = (constraints.maxWidth - FaiSpace.md) / 2;
+            final cardWidth = (constraints.maxWidth - ChainSpace.md) / 2;
             return Wrap(
-              spacing: FaiSpace.md,
-              runSpacing: FaiSpace.md,
+              spacing: ChainSpace.md,
+              runSpacing: ChainSpace.md,
               children: [
                 for (final d in _kDocs)
                   SizedBox(
@@ -1045,30 +1045,30 @@ class _DocCardState extends State<_DocCard> {
       onEnter: (_) => setState(() => _hovered = true),
       onExit: (_) => setState(() => _hovered = false),
       child: AnimatedContainer(
-        duration: FaiMotion.base,
-        curve: FaiMotion.easing,
+        duration: ChainMotion.base,
+        curve: ChainMotion.easing,
         transform: Matrix4.translationValues(0, _hovered ? -2 : 0, 0),
         decoration: BoxDecoration(
-          borderRadius: BorderRadius.circular(FaiRadius.md),
-          boxShadow: _hovered ? FaiElevation.medium(theme.brightness) : null,
+          borderRadius: BorderRadius.circular(ChainRadius.md),
+          boxShadow: _hovered ? ChainElevation.medium(theme.brightness) : null,
         ),
         child: Material(
           color: theme.colorScheme.surfaceContainer,
-          borderRadius: BorderRadius.circular(FaiRadius.md),
+          borderRadius: BorderRadius.circular(ChainRadius.md),
           child: InkWell(
             onTap: () => _DocReaderSheet.show(context, entry),
-            borderRadius: BorderRadius.circular(FaiRadius.md),
+            borderRadius: BorderRadius.circular(ChainRadius.md),
             child: Container(
-              padding: const EdgeInsets.all(FaiSpace.lg),
+              padding: const EdgeInsets.all(ChainSpace.lg),
               decoration: BoxDecoration(
-                borderRadius: BorderRadius.circular(FaiRadius.md),
+                borderRadius: BorderRadius.circular(ChainRadius.md),
                 border: Border.all(color: theme.colorScheme.outlineVariant),
               ),
               child: Row(
                 crossAxisAlignment: CrossAxisAlignment.start,
                 children: [
                   Icon(entry.icon, size: 22, color: theme.colorScheme.primary),
-                  const SizedBox(width: FaiSpace.lg),
+                  const SizedBox(width: ChainSpace.lg),
                   Expanded(
                     child: Column(
                       crossAxisAlignment: CrossAxisAlignment.start,
@@ -1159,7 +1159,7 @@ class _DocReaderSheet extends StatefulWidget {
       backgroundColor: Theme.of(context).colorScheme.surfaceContainer,
       elevation: 8,
       shape: const RoundedRectangleBorder(
-        borderRadius: BorderRadius.vertical(top: Radius.circular(FaiRadius.md)),
+        borderRadius: BorderRadius.vertical(top: Radius.circular(ChainRadius.md)),
       ),
       builder: (_) => _DocReaderSheet(entry: entry),
     );
@@ -1191,7 +1191,7 @@ class _DocReaderSheetState extends State<_DocReaderSheet> {
     // the .dart_tool asset manifest can be inconsistent with
     // the compiled binary — surface "rebuild Studio" as a
     // first-class hint rather than just dumping the raw
-    // PlatformException string into FaiErrorBox.
+    // PlatformException string into ChainErrorBox.
     try {
       return await rootBundle.loadString(localised);
     } catch (firstErr) {
@@ -1219,7 +1219,7 @@ class _DocReaderSheetState extends State<_DocReaderSheet> {
         mainAxisSize: MainAxisSize.min,
         children: [
           Padding(
-            padding: const EdgeInsets.symmetric(vertical: FaiSpace.sm),
+            padding: const EdgeInsets.symmetric(vertical: ChainSpace.sm),
             child: Container(
               width: 40,
               height: 4,
@@ -1231,10 +1231,10 @@ class _DocReaderSheetState extends State<_DocReaderSheet> {
           ),
           Padding(
             padding: const EdgeInsets.fromLTRB(
-              FaiSpace.xxl,
-              FaiSpace.sm,
-              FaiSpace.lg,
-              FaiSpace.sm,
+              ChainSpace.xxl,
+              ChainSpace.sm,
+              ChainSpace.lg,
+              ChainSpace.sm,
             ),
             child: Row(
               children: [
@@ -1243,7 +1243,7 @@ class _DocReaderSheetState extends State<_DocReaderSheet> {
                   size: 20,
                   color: theme.colorScheme.primary,
                 ),
-                const SizedBox(width: FaiSpace.sm),
+                const SizedBox(width: ChainSpace.sm),
                 Expanded(
                   child: Text(
                     widget.entry.title(l),
@@ -1268,7 +1268,7 @@ class _DocReaderSheetState extends State<_DocReaderSheet> {
               builder: (context, snap) {
                 if (snap.connectionState == ConnectionState.waiting) {
                   return const Padding(
-                    padding: EdgeInsets.all(FaiSpace.xxl),
+                    padding: EdgeInsets.all(ChainSpace.xxl),
                     child: Center(child: CircularProgressIndicator()),
                   );
                 }
@@ -1276,7 +1276,7 @@ class _DocReaderSheetState extends State<_DocReaderSheet> {
                   final err = snap.error;
                   final structured = err is _DocReaderError ? err : null;
                   return Padding(
-                    padding: const EdgeInsets.all(FaiSpace.xxl),
+                    padding: const EdgeInsets.all(ChainSpace.xxl),
                     child: Column(
                       crossAxisAlignment: CrossAxisAlignment.start,
                       children: [
@@ -1286,21 +1286,21 @@ class _DocReaderSheetState extends State<_DocReaderSheet> {
                             color: theme.colorScheme.error,
                           ),
                         ),
-                        const SizedBox(height: FaiSpace.sm),
+                        const SizedBox(height: ChainSpace.sm),
                         if (structured != null)
-                          FaiErrorBox(
+                          ChainErrorBox(
                             text: structured.localizedBody(l),
                             isError: true,
                             maxHeight: 200,
                           )
                         else
-                          FaiErrorBox(
+                          ChainErrorBox(
                             error: err,
                             isError: true,
                             maxHeight: 200,
                           ),
                         if (structured != null) ...[
-                          const SizedBox(height: FaiSpace.md),
+                          const SizedBox(height: ChainSpace.md),
                           TextButton.icon(
                             icon: const Icon(Icons.open_in_new, size: 16),
                             label: Text(structured.forgejoUrl),
@@ -1314,14 +1314,14 @@ class _DocReaderSheetState extends State<_DocReaderSheet> {
                 }
                 return Markdown(
                   data: snap.data ?? '',
-                  padding: const EdgeInsets.all(FaiSpace.xxl),
+                  padding: const EdgeInsets.all(ChainSpace.xxl),
                   selectable: true,
                   onTapLink: (text, href, title) async {
                     if (href != null && href.isNotEmpty) {
                       await SystemActions.openInOs(href);
                     }
                   },
-                  styleSheet: FaiTheme.markdownStyle(theme),
+                  styleSheet: ChainTheme.markdownStyle(theme),
                 );
               },
             ),
diff --git a/lib/theme/theme.dart b/lib/theme/theme.dart
index 2036fdc..7f2d911 100644
--- a/lib/theme/theme.dart
+++ b/lib/theme/theme.dart
@@ -5,8 +5,8 @@ import 'package:flutter_markdown_plus/flutter_markdown_plus.dart';
 
 import 'tokens.dart';
 
-class FaiTheme {
-  FaiTheme._();
+class ChainTheme {
+  ChainTheme._();
 
   /// Bundled font families. Declared in pubspec.yaml `fonts:` and
   /// shipped as TTF assets under `assets/fonts/` — NOT fetched at
@@ -79,7 +79,7 @@ class FaiTheme {
   }
 
   /// JetBrains Mono for monospaced technical content. Used by
-  /// FaiMono helper. Only Regular (400) and Medium (500) weights
+  /// ChainMono helper. Only Regular (400) and Medium (500) weights
   /// are bundled — heavier requests fall back to the nearest.
   static TextStyle mono({
     double size = 12,
@@ -125,25 +125,25 @@ class FaiTheme {
       ).copyWith(backgroundColor: Colors.transparent),
       codeblockDecoration: BoxDecoration(
         color: theme.colorScheme.surfaceContainerHigh,
-        borderRadius: BorderRadius.circular(FaiRadius.sm),
+        borderRadius: BorderRadius.circular(ChainRadius.sm),
         border: Border.all(color: theme.colorScheme.outlineVariant),
       ),
-      codeblockPadding: const EdgeInsets.all(FaiSpace.md),
+      codeblockPadding: const EdgeInsets.all(ChainSpace.md),
       blockquote: theme.textTheme.bodyMedium?.copyWith(
         color: theme.colorScheme.onSurface,
       ),
       blockquoteDecoration: BoxDecoration(
         color: theme.colorScheme.surfaceContainer,
-        borderRadius: BorderRadius.circular(FaiRadius.sm),
+        borderRadius: BorderRadius.circular(ChainRadius.sm),
         border: Border(
           left: BorderSide(color: theme.colorScheme.primary, width: 3),
         ),
       ),
       blockquotePadding: const EdgeInsets.fromLTRB(
-        FaiSpace.md,
-        FaiSpace.sm,
-        FaiSpace.sm,
-        FaiSpace.sm,
+        ChainSpace.md,
+        ChainSpace.sm,
+        ChainSpace.sm,
+        ChainSpace.sm,
       ),
       tableCellsDecoration: BoxDecoration(
         color: theme.colorScheme.surfaceContainerHigh,
@@ -164,32 +164,32 @@ class FaiTheme {
   static ThemeData dark() {
     final scheme = ColorScheme(
       brightness: Brightness.dark,
-      primary: FaiColors.accent,
-      onPrimary: FaiColors.black,
-      primaryContainer: FaiColors.accentMuted,
-      onPrimaryContainer: FaiColors.textStrong,
-      secondary: FaiColors.accentDeep,
-      onSecondary: FaiColors.black,
-      secondaryContainer: FaiColors.surfaceHigh,
-      onSecondaryContainer: FaiColors.text,
-      tertiary: FaiColors.accent,
-      onTertiary: FaiColors.black,
-      tertiaryContainer: FaiColors.surfaceHigh,
-      onTertiaryContainer: FaiColors.text,
-      error: FaiColors.danger,
-      onError: FaiColors.textStrong,
+      primary: ChainColors.accent,
+      onPrimary: ChainColors.black,
+      primaryContainer: ChainColors.accentMuted,
+      onPrimaryContainer: ChainColors.textStrong,
+      secondary: ChainColors.accentDeep,
+      onSecondary: ChainColors.black,
+      secondaryContainer: ChainColors.surfaceHigh,
+      onSecondaryContainer: ChainColors.text,
+      tertiary: ChainColors.accent,
+      onTertiary: ChainColors.black,
+      tertiaryContainer: ChainColors.surfaceHigh,
+      onTertiaryContainer: ChainColors.text,
+      error: ChainColors.danger,
+      onError: ChainColors.textStrong,
       errorContainer: const Color(0xFF3F1518),
       onErrorContainer: const Color(0xFFFCA5A5),
-      surface: FaiColors.black,
-      onSurface: FaiColors.text,
-      onSurfaceVariant: FaiColors.muted,
-      outline: FaiColors.border,
-      outlineVariant: FaiColors.border,
-      surfaceContainerLowest: FaiColors.black,
-      surfaceContainerLow: FaiColors.surface,
-      surfaceContainer: FaiColors.surface,
-      surfaceContainerHigh: FaiColors.surfaceHigh,
-      surfaceContainerHighest: FaiColors.surfaceHigh,
+      surface: ChainColors.black,
+      onSurface: ChainColors.text,
+      onSurfaceVariant: ChainColors.muted,
+      outline: ChainColors.border,
+      outlineVariant: ChainColors.border,
+      surfaceContainerLowest: ChainColors.black,
+      surfaceContainerLow: ChainColors.surface,
+      surfaceContainer: ChainColors.surface,
+      surfaceContainerHigh: ChainColors.surfaceHigh,
+      surfaceContainerHighest: ChainColors.surfaceHigh,
     );
     return _build(scheme);
   }
@@ -197,32 +197,32 @@ class FaiTheme {
   static ThemeData light() {
     final scheme = ColorScheme(
       brightness: Brightness.light,
-      primary: FaiColors.accentDeep,
-      onPrimary: FaiColors.lightSurface,
+      primary: ChainColors.accentDeep,
+      onPrimary: ChainColors.lightSurface,
       primaryContainer: const Color(0xFFE0F2FE),
-      onPrimaryContainer: FaiColors.accentMuted,
-      secondary: FaiColors.accentMuted,
-      onSecondary: FaiColors.lightSurface,
-      secondaryContainer: FaiColors.lightSurfaceHigh,
-      onSecondaryContainer: FaiColors.lightText,
-      tertiary: FaiColors.accentDeep,
-      onTertiary: FaiColors.lightSurface,
+      onPrimaryContainer: ChainColors.accentMuted,
+      secondary: ChainColors.accentMuted,
+      onSecondary: ChainColors.lightSurface,
+      secondaryContainer: ChainColors.lightSurfaceHigh,
+      onSecondaryContainer: ChainColors.lightText,
+      tertiary: ChainColors.accentDeep,
+      onTertiary: ChainColors.lightSurface,
       tertiaryContainer: const Color(0xFFE0F2FE),
-      onTertiaryContainer: FaiColors.accentMuted,
-      error: FaiColors.danger,
-      onError: FaiColors.lightSurface,
+      onTertiaryContainer: ChainColors.accentMuted,
+      error: ChainColors.danger,
+      onError: ChainColors.lightSurface,
       errorContainer: const Color(0xFFFEE2E2),
       onErrorContainer: const Color(0xFF7F1D1D),
-      surface: FaiColors.lightCanvas,
-      onSurface: FaiColors.lightText,
-      onSurfaceVariant: FaiColors.lightMuted,
-      outline: FaiColors.lightBorder,
-      outlineVariant: FaiColors.lightBorder,
-      surfaceContainerLowest: FaiColors.lightCanvas,
-      surfaceContainerLow: FaiColors.lightSurface,
-      surfaceContainer: FaiColors.lightSurface,
-      surfaceContainerHigh: FaiColors.lightSurfaceHigh,
-      surfaceContainerHighest: FaiColors.lightSurfaceHigh,
+      surface: ChainColors.lightCanvas,
+      onSurface: ChainColors.lightText,
+      onSurfaceVariant: ChainColors.lightMuted,
+      outline: ChainColors.lightBorder,
+      outlineVariant: ChainColors.lightBorder,
+      surfaceContainerLowest: ChainColors.lightCanvas,
+      surfaceContainerLow: ChainColors.lightSurface,
+      surfaceContainer: ChainColors.lightSurface,
+      surfaceContainerHigh: ChainColors.lightSurfaceHigh,
+      surfaceContainerHighest: ChainColors.lightSurfaceHigh,
     );
     return _build(scheme);
   }
@@ -256,7 +256,7 @@ class FaiTheme {
         color: scheme.surfaceContainer,
         elevation: 0,
         shape: RoundedRectangleBorder(
-          borderRadius: BorderRadius.circular(FaiRadius.md),
+          borderRadius: BorderRadius.circular(ChainRadius.md),
           side: BorderSide(color: scheme.outlineVariant),
         ),
         margin: EdgeInsets.zero,
@@ -266,14 +266,14 @@ class FaiTheme {
           backgroundColor: scheme.primary,
           foregroundColor: scheme.onPrimary,
           shape: RoundedRectangleBorder(
-            borderRadius: BorderRadius.circular(FaiRadius.sm),
+            borderRadius: BorderRadius.circular(ChainRadius.sm),
           ),
           padding: const EdgeInsets.symmetric(
-            horizontal: FaiSpace.lg,
-            vertical: FaiSpace.md,
+            horizontal: ChainSpace.lg,
+            vertical: ChainSpace.md,
           ),
           textStyle: textTheme.labelMedium,
-          animationDuration: FaiMotion.fast,
+          animationDuration: ChainMotion.fast,
         ),
       ),
       outlinedButtonTheme: OutlinedButtonThemeData(
@@ -281,14 +281,14 @@ class FaiTheme {
           foregroundColor: scheme.onSurface,
           side: BorderSide(color: scheme.outline),
           shape: RoundedRectangleBorder(
-            borderRadius: BorderRadius.circular(FaiRadius.sm),
+            borderRadius: BorderRadius.circular(ChainRadius.sm),
           ),
           padding: const EdgeInsets.symmetric(
-            horizontal: FaiSpace.lg,
-            vertical: FaiSpace.md,
+            horizontal: ChainSpace.lg,
+            vertical: ChainSpace.md,
           ),
           textStyle: textTheme.labelMedium,
-          animationDuration: FaiMotion.fast,
+          animationDuration: ChainMotion.fast,
         ),
       ),
       iconButtonTheme: IconButtonThemeData(
@@ -323,7 +323,7 @@ class FaiTheme {
         ),
         behavior: SnackBarBehavior.floating,
         shape: RoundedRectangleBorder(
-          borderRadius: BorderRadius.circular(FaiRadius.sm),
+          borderRadius: BorderRadius.circular(ChainRadius.sm),
         ),
       ),
     );
diff --git a/lib/theme/tokens.dart b/lib/theme/tokens.dart
index b583607..fdd010d 100644
--- a/lib/theme/tokens.dart
+++ b/lib/theme/tokens.dart
@@ -7,8 +7,8 @@ import 'package:flutter/material.dart';
 
 /// Colour palette. Single strong accent (Ch∆In Cyan) plus neutral
 /// greys. Status colours stay restrained — no candy palette.
-class FaiColors {
-  FaiColors._();
+class ChainColors {
+  ChainColors._();
 
   // Brand accent. Slightly cooler / more saturated than the
   // initial #1E3A8A — this reads more as "deep tech, alive"
@@ -43,8 +43,8 @@ class FaiColors {
 
 /// Spacing scale. Stick to multiples of 4. Keep the vocabulary
 /// small — six steps cover everything.
-class FaiSpace {
-  FaiSpace._();
+class ChainSpace {
+  ChainSpace._();
   static const xs = 4.0;
   static const sm = 8.0;
   static const md = 12.0;
@@ -55,8 +55,8 @@ class FaiSpace {
 }
 
 /// Border radii. Two sizes only.
-class FaiRadius {
-  FaiRadius._();
+class ChainRadius {
+  ChainRadius._();
   static const sm = 6.0;
   static const md = 10.0;
 }
@@ -66,8 +66,8 @@ class FaiRadius {
 /// Brightness-aware: dark themes lean on deeper, lower-alpha
 /// shadows (they read as ambient occlusion against near-black
 /// surfaces); light themes use softer, slightly larger spreads.
-class FaiElevation {
-  FaiElevation._();
+class ChainElevation {
+  ChainElevation._();
 
   /// Resting elevation for cards and sheets. Just enough to lift
   /// a surface off the canvas without announcing itself.
@@ -106,8 +106,8 @@ class FaiElevation {
 }
 
 /// Animation durations. Keep them under 300ms for power-user feel.
-class FaiMotion {
-  FaiMotion._();
+class ChainMotion {
+  ChainMotion._();
   static const fast = Duration(milliseconds: 120);
   static const base = Duration(milliseconds: 200);
   static const slow = Duration(milliseconds: 320);
diff --git a/lib/widgets/fai_binary_recovery.dart b/lib/widgets/chain_binary_recovery.dart
similarity index 76%
rename from lib/widgets/fai_binary_recovery.dart
rename to lib/widgets/chain_binary_recovery.dart
index d92aa99..263438e 100644
--- a/lib/widgets/fai_binary_recovery.dart
+++ b/lib/widgets/chain_binary_recovery.dart
@@ -1,6 +1,6 @@
 // Recovery affordance shown when Studio cannot locate the `fai`
 // binary on the machine. Replaces the old CLI-jargon dead-end
-// ("set FAI_BIN to its full path") with two acts a non-CLI
+// ("set CHAIN_BIN to its full path") with two acts a non-CLI
 // operator can actually take:
 //
 //   1. Locate the binary with a native file picker, persisting
@@ -14,26 +14,26 @@ import '../data/system_actions.dart';
 import '../l10n/app_localizations.dart';
 import '../theme/tokens.dart';
 
-class FaiBinaryRecovery extends StatelessWidget {
+class ChainBinaryRecovery extends StatelessWidget {
   /// Fired after the operator successfully picks a `fai` binary,
   /// so the host can retry whatever action hit the missing
   /// binary (e.g. re-run the daemon start / status probe).
   final VoidCallback? onLocated;
 
-  const FaiBinaryRecovery({super.key, this.onLocated});
+  const ChainBinaryRecovery({super.key, this.onLocated});
 
   Future<void> _locate(BuildContext context) async {
     final l = AppLocalizations.of(context)!;
     final messenger = ScaffoldMessenger.of(context);
     final picked = await FilePicker.pickFiles(
-      dialogTitle: l.faiBinaryPickerTitle,
+      dialogTitle: l.chainBinaryPickerTitle,
     );
     final path = picked?.files.single.path;
     if (path == null) return;
     final ok = await SystemActions.setFaiBinaryPath(path);
     messenger.showSnackBar(
       SnackBar(
-        content: Text(ok ? l.faiBinarySetOk(path) : l.faiBinaryNotFound),
+        content: Text(ok ? l.chainBinarySetOk(path) : l.chainBinaryNotFound),
       ),
     );
     if (ok) onLocated?.call();
@@ -45,10 +45,10 @@ class FaiBinaryRecovery extends StatelessWidget {
     final l = AppLocalizations.of(context)!;
     return Container(
       width: double.infinity,
-      padding: const EdgeInsets.all(FaiSpace.md),
+      padding: const EdgeInsets.all(ChainSpace.md),
       decoration: BoxDecoration(
         color: theme.colorScheme.errorContainer.withValues(alpha: 0.4),
-        borderRadius: BorderRadius.circular(FaiRadius.sm),
+        borderRadius: BorderRadius.circular(ChainRadius.sm),
         border: Border.all(
           color: theme.colorScheme.error.withValues(alpha: 0.4),
         ),
@@ -57,34 +57,34 @@ class FaiBinaryRecovery extends StatelessWidget {
         crossAxisAlignment: CrossAxisAlignment.start,
         children: [
           Text(
-            l.faiBinaryNotFound,
+            l.chainBinaryNotFound,
             style: theme.textTheme.bodyMedium?.copyWith(
               fontWeight: FontWeight.w600,
               color: theme.colorScheme.error,
             ),
           ),
-          const SizedBox(height: FaiSpace.xs),
+          const SizedBox(height: ChainSpace.xs),
           Text(
-            l.faiBinaryNotFoundHint,
+            l.chainBinaryNotFoundHint,
             style: theme.textTheme.bodySmall?.copyWith(
               color: theme.colorScheme.onSurfaceVariant,
             ),
           ),
-          const SizedBox(height: FaiSpace.md),
+          const SizedBox(height: ChainSpace.md),
           Wrap(
-            spacing: FaiSpace.sm,
-            runSpacing: FaiSpace.sm,
+            spacing: ChainSpace.sm,
+            runSpacing: ChainSpace.sm,
             children: [
               FilledButton.tonalIcon(
                 onPressed: () => _locate(context),
                 icon: const Icon(Icons.folder_open, size: 16),
-                label: Text(l.faiBinaryLocateButton),
+                label: Text(l.chainBinaryLocateButton),
               ),
               OutlinedButton.icon(
                 onPressed: () =>
                     SystemActions.openInOs(kFaiInstallDocsUrl),
                 icon: const Icon(Icons.open_in_new, size: 16),
-                label: Text(l.faiBinaryInstallDocsButton),
+                label: Text(l.chainBinaryInstallDocsButton),
               ),
             ],
           ),
diff --git a/lib/widgets/fai_card.dart b/lib/widgets/chain_card.dart
similarity index 85%
rename from lib/widgets/fai_card.dart
rename to lib/widgets/chain_card.dart
index 7eb6cc3..63c5e0a 100644
--- a/lib/widgets/fai_card.dart
+++ b/lib/widgets/chain_card.dart
@@ -1,11 +1,11 @@
-// FaiCard — flat card with subtle accent gradient on the top
+// ChainCard — flat card with subtle accent gradient on the top
 // border. Replaces Material's default Card for the Ch∆In look.
 
 import 'package:flutter/material.dart';
 
 import '../theme/tokens.dart';
 
-class FaiCard extends StatelessWidget {
+class ChainCard extends StatelessWidget {
   /// Card body. Padding is applied internally; pass plain content.
   final Widget child;
 
@@ -18,15 +18,15 @@ class FaiCard extends StatelessWidget {
   /// Used by status rows (live event, healthy service).
   final Color? accentLeft;
 
-  /// Internal padding. Defaults to [FaiSpace.lg].
+  /// Internal padding. Defaults to [ChainSpace.lg].
   final EdgeInsetsGeometry padding;
 
-  const FaiCard({
+  const ChainCard({
     super.key,
     required this.child,
     this.accentTop = false,
     this.accentLeft,
-    this.padding = const EdgeInsets.all(FaiSpace.lg),
+    this.padding = const EdgeInsets.all(ChainSpace.lg),
   });
 
   @override
@@ -35,7 +35,7 @@ class FaiCard extends StatelessWidget {
     return Container(
       decoration: BoxDecoration(
         color: theme.colorScheme.surfaceContainer,
-        borderRadius: BorderRadius.circular(FaiRadius.md),
+        borderRadius: BorderRadius.circular(ChainRadius.md),
         border: Border.all(color: theme.colorScheme.outlineVariant),
       ),
       clipBehavior: Clip.antiAlias,
@@ -61,8 +61,8 @@ class FaiCard extends StatelessWidget {
             ),
           if (accentLeft != null)
             Positioned(
-              top: FaiSpace.md,
-              bottom: FaiSpace.md,
+              top: ChainSpace.md,
+              bottom: ChainSpace.md,
               left: 0,
               width: 3,
               child: DecoratedBox(
diff --git a/lib/widgets/fai_data_row.dart b/lib/widgets/chain_data_row.dart
similarity index 83%
rename from lib/widgets/fai_data_row.dart
rename to lib/widgets/chain_data_row.dart
index f83aa3b..50cd9bc 100644
--- a/lib/widgets/fai_data_row.dart
+++ b/lib/widgets/chain_data_row.dart
@@ -1,4 +1,4 @@
-// FaiDataRow — Linear-style dense list row used by the audit
+// ChainDataRow — Linear-style dense list row used by the audit
 // stream. Hover-elevation, accent-coloured leading stripe, mono
 // timestamp, expressive type badge.
 
@@ -7,7 +7,7 @@ import 'package:flutter/material.dart';
 import '../theme/theme.dart';
 import '../theme/tokens.dart';
 
-class FaiDataRow extends StatefulWidget {
+class ChainDataRow extends StatefulWidget {
   /// Coloured leading stripe (4px). Used to encode event type
   /// (success / warning / failure) at a glance.
   final Color accent;
@@ -27,7 +27,7 @@ class FaiDataRow extends StatefulWidget {
   /// Optional tap handler.
   final VoidCallback? onTap;
 
-  const FaiDataRow({
+  const ChainDataRow({
     super.key,
     required this.accent,
     required this.leading,
@@ -38,10 +38,10 @@ class FaiDataRow extends StatefulWidget {
   });
 
   @override
-  State<FaiDataRow> createState() => _FaiDataRowState();
+  State<ChainDataRow> createState() => _FaiDataRowState();
 }
 
-class _FaiDataRowState extends State<FaiDataRow> {
+class _FaiDataRowState extends State<ChainDataRow> {
   bool _hovered = false;
 
   @override
@@ -57,12 +57,12 @@ class _FaiDataRowState extends State<FaiDataRow> {
         onTap: widget.onTap,
         behavior: HitTestBehavior.opaque,
         child: AnimatedContainer(
-          duration: FaiMotion.fast,
+          duration: ChainMotion.fast,
           decoration: BoxDecoration(
             color: _hovered
                 ? theme.colorScheme.surfaceContainerHigh
                 : theme.colorScheme.surfaceContainer,
-            borderRadius: BorderRadius.circular(FaiRadius.sm),
+            borderRadius: BorderRadius.circular(ChainRadius.sm),
             border: Border.all(
               color: _hovered
                   ? theme.colorScheme.outline
@@ -70,8 +70,8 @@ class _FaiDataRowState extends State<FaiDataRow> {
             ),
           ),
           padding: const EdgeInsets.symmetric(
-            horizontal: FaiSpace.md,
-            vertical: FaiSpace.sm,
+            horizontal: ChainSpace.md,
+            vertical: ChainSpace.sm,
           ),
           child: Row(
             children: [
@@ -83,12 +83,12 @@ class _FaiDataRowState extends State<FaiDataRow> {
                   borderRadius: BorderRadius.circular(2),
                 ),
               ),
-              const SizedBox(width: FaiSpace.md),
+              const SizedBox(width: ChainSpace.md),
               SizedBox(
                 width: 88,
                 child: Text(
                   widget.leading,
-                  style: FaiTheme.mono(
+                  style: ChainTheme.mono(
                     size: 11,
                     color: theme.colorScheme.onSurfaceVariant,
                   ),
@@ -98,7 +98,7 @@ class _FaiDataRowState extends State<FaiDataRow> {
                 width: 200,
                 child: Text(
                   widget.title,
-                  style: FaiTheme.mono(
+                  style: ChainTheme.mono(
                     size: 12,
                     weight: FontWeight.w500,
                     color: theme.colorScheme.onSurface,
@@ -116,10 +116,10 @@ class _FaiDataRowState extends State<FaiDataRow> {
               ),
               if (widget.trailing != null)
                 Padding(
-                  padding: const EdgeInsets.only(left: FaiSpace.md),
+                  padding: const EdgeInsets.only(left: ChainSpace.md),
                   child: Text(
                     widget.trailing!,
-                    style: FaiTheme.mono(
+                    style: ChainTheme.mono(
                       size: 11,
                       color: theme.colorScheme.onSurfaceVariant,
                     ),
diff --git a/lib/widgets/fai_delta_mark.dart b/lib/widgets/chain_delta_mark.dart
similarity index 77%
rename from lib/widgets/fai_delta_mark.dart
rename to lib/widgets/chain_delta_mark.dart
index 025988c..ae05a1f 100644
--- a/lib/widgets/fai_delta_mark.dart
+++ b/lib/widgets/chain_delta_mark.dart
@@ -1,4 +1,4 @@
-// FaiDeltaMark — the Ch∆In signature element. A precise triangle
+// ChainDeltaMark — the Ch∆In signature element. A precise triangle
 // (∆) drawn from primitives, not a font glyph. Three states:
 //
 // - idle: static, accent colour, soft glow
@@ -12,25 +12,25 @@ import 'dart:math';
 
 import 'package:flutter/material.dart';
 
-enum FaiDeltaMode { idle, live, busy }
+enum ChainDeltaMode { idle, live, busy }
 
-class FaiDeltaMark extends StatefulWidget {
-  final FaiDeltaMode mode;
+class ChainDeltaMark extends StatefulWidget {
+  final ChainDeltaMode mode;
   final double size;
   final Color color;
 
-  const FaiDeltaMark({
+  const ChainDeltaMark({
     super.key,
     required this.color,
-    this.mode = FaiDeltaMode.idle,
+    this.mode = ChainDeltaMode.idle,
     this.size = 36,
   });
 
   @override
-  State<FaiDeltaMark> createState() => _FaiDeltaMarkState();
+  State<ChainDeltaMark> createState() => _FaiDeltaMarkState();
 }
 
-class _FaiDeltaMarkState extends State<FaiDeltaMark>
+class _FaiDeltaMarkState extends State<ChainDeltaMark>
     with SingleTickerProviderStateMixin {
   late final AnimationController _ctrl;
 
@@ -44,13 +44,13 @@ class _FaiDeltaMarkState extends State<FaiDeltaMark>
     _restart();
   }
 
-  Duration _durationFor(FaiDeltaMode m) {
+  Duration _durationFor(ChainDeltaMode m) {
     switch (m) {
-      case FaiDeltaMode.idle:
+      case ChainDeltaMode.idle:
         return const Duration(seconds: 1);
-      case FaiDeltaMode.live:
+      case ChainDeltaMode.live:
         return const Duration(milliseconds: 1600);
-      case FaiDeltaMode.busy:
+      case ChainDeltaMode.busy:
         return const Duration(seconds: 4);
     }
   }
@@ -58,21 +58,21 @@ class _FaiDeltaMarkState extends State<FaiDeltaMark>
   void _restart() {
     _ctrl.duration = _durationFor(widget.mode);
     switch (widget.mode) {
-      case FaiDeltaMode.idle:
+      case ChainDeltaMode.idle:
         _ctrl.stop();
         _ctrl.value = 0;
         break;
-      case FaiDeltaMode.live:
+      case ChainDeltaMode.live:
         _ctrl.repeat(reverse: true);
         break;
-      case FaiDeltaMode.busy:
+      case ChainDeltaMode.busy:
         _ctrl.repeat();
         break;
     }
   }
 
   @override
-  void didUpdateWidget(covariant FaiDeltaMark old) {
+  void didUpdateWidget(covariant ChainDeltaMark old) {
     super.didUpdateWidget(old);
     if (old.mode != widget.mode) _restart();
   }
@@ -103,7 +103,7 @@ class _FaiDeltaMarkState extends State<FaiDeltaMark>
 
 class _DeltaPainter extends CustomPainter {
   final Color color;
-  final FaiDeltaMode mode;
+  final ChainDeltaMode mode;
   final double t;
 
   _DeltaPainter({required this.color, required this.mode, required this.t});
@@ -115,12 +115,12 @@ class _DeltaPainter extends CustomPainter {
 
     // In live mode: scale the whole mark between 0.85 and 1.15
     // so the pulse is visible without staring. Idle stays at 1.0.
-    final scale = mode == FaiDeltaMode.live ? 0.85 + 0.30 * t : 1.0;
+    final scale = mode == ChainDeltaMode.live ? 0.85 + 0.30 * t : 1.0;
     final r = size.width * 0.36 * scale;
 
     canvas.save();
     canvas.translate(cx, cy);
-    if (mode == FaiDeltaMode.busy) {
+    if (mode == ChainDeltaMode.busy) {
       canvas.rotate(t * 2 * pi);
     }
 
@@ -133,8 +133,8 @@ class _DeltaPainter extends CustomPainter {
 
     // Glow halo. In live mode the glow ring grows with the pulse
     // and the alpha breathes harder.
-    if (mode != FaiDeltaMode.idle) {
-      final pulseStrength = mode == FaiDeltaMode.live ? t : 1.0;
+    if (mode != ChainDeltaMode.idle) {
+      final pulseStrength = mode == ChainDeltaMode.live ? t : 1.0;
       final glow = Paint()
         ..color = color.withValues(alpha: 0.30 + 0.40 * pulseStrength)
         ..maskFilter = MaskFilter.blur(BlurStyle.normal, 8 + 14 * pulseStrength)
@@ -143,7 +143,7 @@ class _DeltaPainter extends CustomPainter {
     }
 
     // Filled triangle, brighter on the up-beat for live mode.
-    final fillAlpha = mode == FaiDeltaMode.live ? 0.15 + 0.20 * t : 0.18;
+    final fillAlpha = mode == ChainDeltaMode.live ? 0.15 + 0.20 * t : 0.18;
     final fill = Paint()
       ..color = color.withValues(alpha: fillAlpha)
       ..style = PaintingStyle.fill;
@@ -158,7 +158,7 @@ class _DeltaPainter extends CustomPainter {
     canvas.drawPath(path, stroke);
 
     // Inner accent dot.
-    final dotAlpha = mode == FaiDeltaMode.live ? 0.55 + 0.45 * t : 1.0;
+    final dotAlpha = mode == ChainDeltaMode.live ? 0.55 + 0.45 * t : 1.0;
     final dot = Paint()
       ..color = color.withValues(alpha: dotAlpha)
       ..style = PaintingStyle.fill;
diff --git a/lib/widgets/fai_empty_state.dart b/lib/widgets/chain_empty_state.dart
similarity index 86%
rename from lib/widgets/fai_empty_state.dart
rename to lib/widgets/chain_empty_state.dart
index 979afd9..4c63ffc 100644
--- a/lib/widgets/fai_empty_state.dart
+++ b/lib/widgets/chain_empty_state.dart
@@ -1,4 +1,4 @@
-// FaiEmptyState — gracious empty / loading / error placeholder.
+// ChainEmptyState — gracious empty / loading / error placeholder.
 // Replaces "(no data)" strings with one tone, one icon, one tip.
 //
 // The blank surface is where an app most easily feels unfinished,
@@ -11,9 +11,9 @@
 import 'package:flutter/material.dart';
 
 import '../theme/tokens.dart';
-import 'fai_delta_mark.dart';
+import 'chain_delta_mark.dart';
 
-class FaiEmptyState extends StatelessWidget {
+class ChainEmptyState extends StatelessWidget {
   final IconData icon;
   final String title;
   final String? hint;
@@ -23,7 +23,7 @@ class FaiEmptyState extends StatelessWidget {
   /// for connection-failure variants.
   final Color? iconColor;
 
-  const FaiEmptyState({
+  const ChainEmptyState({
     super.key,
     required this.icon,
     required this.title,
@@ -40,7 +40,7 @@ class FaiEmptyState extends StatelessWidget {
       child: ConstrainedBox(
         constraints: const BoxConstraints(maxWidth: 440),
         child: Padding(
-          padding: const EdgeInsets.all(FaiSpace.xxl),
+          padding: const EdgeInsets.all(ChainSpace.xxl),
           child: Column(
             mainAxisAlignment: MainAxisAlignment.center,
             mainAxisSize: MainAxisSize.min,
@@ -57,7 +57,7 @@ class FaiEmptyState extends StatelessWidget {
                   children: [
                     Opacity(
                       opacity: 0.10,
-                      child: FaiDeltaMark(
+                      child: ChainDeltaMark(
                         color: theme.colorScheme.primary,
                         size: 112,
                       ),
@@ -71,14 +71,14 @@ class FaiEmptyState extends StatelessWidget {
                         border: Border.all(
                           color: color.withValues(alpha: 0.18),
                         ),
-                        boxShadow: FaiElevation.low(theme.brightness),
+                        boxShadow: ChainElevation.low(theme.brightness),
                       ),
                       child: Icon(icon, size: 26, color: color),
                     ),
                   ],
                 ),
               ),
-              const SizedBox(height: FaiSpace.xl),
+              const SizedBox(height: ChainSpace.xl),
               Text(
                 title,
                 textAlign: TextAlign.center,
@@ -87,7 +87,7 @@ class FaiEmptyState extends StatelessWidget {
                 ),
               ),
               if (hint != null) ...[
-                const SizedBox(height: FaiSpace.sm),
+                const SizedBox(height: ChainSpace.sm),
                 Text(
                   hint!,
                   textAlign: TextAlign.center,
@@ -98,7 +98,7 @@ class FaiEmptyState extends StatelessWidget {
                 ),
               ],
               if (action != null) ...[
-                const SizedBox(height: FaiSpace.xl),
+                const SizedBox(height: ChainSpace.xl),
                 action!,
               ],
             ],
diff --git a/lib/widgets/fai_en_badge.dart b/lib/widgets/chain_en_badge.dart
similarity index 84%
rename from lib/widgets/fai_en_badge.dart
rename to lib/widgets/chain_en_badge.dart
index 9af93d0..ca73ac1 100644
--- a/lib/widgets/fai_en_badge.dart
+++ b/lib/widgets/chain_en_badge.dart
@@ -1,4 +1,4 @@
-// FaiEnBadge — small "[EN]" pill shown next to text that came
+// ChainEnBadge — small "[EN]" pill shown next to text that came
 // from outside Studio's localization pipeline (MCP server tool
 // names, n8n endpoint descriptions, native LLM responses).
 //
@@ -14,21 +14,21 @@ import 'package:flutter/material.dart';
 import '../l10n/app_localizations.dart';
 import '../theme/tokens.dart';
 
-class FaiEnBadge extends StatelessWidget {
+class ChainEnBadge extends StatelessWidget {
   /// When true, the badge renders. When false (e.g. the active
   /// locale already is English), it returns
   /// `SizedBox.shrink()` so callers can drop it inline without
   /// guarding visibility themselves.
   final bool visible;
 
-  const FaiEnBadge({super.key, required this.visible});
+  const ChainEnBadge({super.key, required this.visible});
 
   /// Convenience constructor: derives `visible` from the active
   /// Localizations locale. Use this from inside a Build method
   /// where you already have a BuildContext.
-  factory FaiEnBadge.forContext(BuildContext context) {
+  factory ChainEnBadge.forContext(BuildContext context) {
     final lang = Localizations.localeOf(context).languageCode;
-    return FaiEnBadge(visible: lang != 'en');
+    return ChainEnBadge(visible: lang != 'en');
   }
 
   @override
@@ -42,7 +42,7 @@ class FaiEnBadge extends StatelessWidget {
         padding: const EdgeInsets.symmetric(horizontal: 6, vertical: 1),
         decoration: BoxDecoration(
           color: theme.colorScheme.surfaceContainerHighest,
-          borderRadius: BorderRadius.circular(FaiRadius.sm),
+          borderRadius: BorderRadius.circular(ChainRadius.sm),
           border: Border.all(color: theme.colorScheme.outlineVariant),
         ),
         child: Text(
diff --git a/lib/widgets/fai_error_box.dart b/lib/widgets/chain_error_box.dart
similarity index 90%
rename from lib/widgets/fai_error_box.dart
rename to lib/widgets/chain_error_box.dart
index fecad0c..1963f02 100644
--- a/lib/widgets/fai_error_box.dart
+++ b/lib/widgets/chain_error_box.dart
@@ -1,4 +1,4 @@
-// FaiErrorBox — selectable monospace error / output block with
+// ChainErrorBox — selectable monospace error / output block with
 // a small copy-to-clipboard button in the top-right corner.
 //
 // Used wherever the operator might want to paste daemon stderr
@@ -15,7 +15,7 @@ import '../l10n/app_localizations.dart';
 import '../theme/theme.dart';
 import '../theme/tokens.dart';
 
-class FaiErrorBox extends StatefulWidget {
+class ChainErrorBox extends StatefulWidget {
   /// The text the operator wants to read (and copy). Rendered
   /// monospace, selectable, multi-line. Ignored when [error] is
   /// supplied.
@@ -41,7 +41,7 @@ class FaiErrorBox extends StatefulWidget {
   /// trailers otherwise.
   final Object? error;
 
-  const FaiErrorBox({
+  const ChainErrorBox({
     super.key,
     this.text = '',
     this.isError = false,
@@ -49,14 +49,14 @@ class FaiErrorBox extends StatefulWidget {
     this.error,
   }) : assert(
          text != '' || error != null,
-         'FaiErrorBox needs either text or error',
+         'ChainErrorBox needs either text or error',
        );
 
   @override
-  State<FaiErrorBox> createState() => _FaiErrorBoxState();
+  State<ChainErrorBox> createState() => _FaiErrorBoxState();
 }
 
-class _FaiErrorBoxState extends State<FaiErrorBox> {
+class _FaiErrorBoxState extends State<ChainErrorBox> {
   bool _justCopied = false;
   bool _detailExpanded = false;
 
@@ -86,14 +86,14 @@ class _FaiErrorBoxState extends State<FaiErrorBox> {
     return Container(
       width: double.infinity,
       padding: const EdgeInsets.fromLTRB(
-        FaiSpace.sm,
-        FaiSpace.xs,
-        FaiSpace.xs,
-        FaiSpace.sm,
+        ChainSpace.sm,
+        ChainSpace.xs,
+        ChainSpace.xs,
+        ChainSpace.sm,
       ),
       decoration: BoxDecoration(
         color: theme.colorScheme.surfaceContainerHigh,
-        borderRadius: BorderRadius.circular(FaiRadius.sm),
+        borderRadius: BorderRadius.circular(ChainRadius.sm),
         border: Border.all(color: accent.withValues(alpha: 0.4)),
       ),
       child: Column(
@@ -133,7 +133,7 @@ class _FaiErrorBoxState extends State<FaiErrorBox> {
               ),
             ],
             if (friendly.detail.isNotEmpty) ...[
-              const SizedBox(height: FaiSpace.sm),
+              const SizedBox(height: ChainSpace.sm),
               InkWell(
                 onTap: () => setState(() {
                   _detailExpanded = !_detailExpanded;
@@ -159,7 +159,7 @@ class _FaiErrorBoxState extends State<FaiErrorBox> {
                 ),
               ),
               if (_detailExpanded) ...[
-                const SizedBox(height: FaiSpace.xs),
+                const SizedBox(height: ChainSpace.xs),
                 ConstrainedBox(
                   constraints: BoxConstraints(
                     maxHeight: widget.maxHeight ?? double.infinity,
@@ -168,7 +168,7 @@ class _FaiErrorBoxState extends State<FaiErrorBox> {
                     child: SingleChildScrollView(
                       child: SelectableText(
                         friendly.detail,
-                        style: FaiTheme.mono(
+                        style: ChainTheme.mono(
                           size: 11,
                           color: theme.colorScheme.onSurfaceVariant,
                         ),
@@ -187,7 +187,7 @@ class _FaiErrorBoxState extends State<FaiErrorBox> {
                 child: SingleChildScrollView(
                   child: SelectableText(
                     widget.text,
-                    style: FaiTheme.mono(size: 11, color: fg),
+                    style: ChainTheme.mono(size: 11, color: fg),
                   ),
                 ),
               ),
diff --git a/lib/widgets/fai_flow_output.dart b/lib/widgets/chain_flow_output.dart
similarity index 87%
rename from lib/widgets/fai_flow_output.dart
rename to lib/widgets/chain_flow_output.dart
index 8e59a03..ebe744e 100644
--- a/lib/widgets/fai_flow_output.dart
+++ b/lib/widgets/chain_flow_output.dart
@@ -1,4 +1,4 @@
-// FaiFlowOutput — type-aware renderer for one entry in
+// ChainFlowOutput — type-aware renderer for one entry in
 // `runSavedFlow`'s output map. Reads `FlowOutput` and dispatches
 // to the right widget:
 //
@@ -27,10 +27,10 @@ import '../l10n/app_localizations.dart';
 import '../theme/theme.dart';
 import '../theme/tokens.dart';
 
-class FaiFlowOutput extends StatelessWidget {
+class ChainFlowOutput extends StatelessWidget {
   final FlowOutput output;
 
-  const FaiFlowOutput({super.key, required this.output});
+  const ChainFlowOutput({super.key, required this.output});
 
   @override
   Widget build(BuildContext context) {
@@ -75,10 +75,10 @@ class _TextView extends StatelessWidget {
     if (_looksLikeMarkdown) {
       return Container(
         width: double.infinity,
-        padding: const EdgeInsets.all(FaiSpace.md),
+        padding: const EdgeInsets.all(ChainSpace.md),
         decoration: BoxDecoration(
           color: theme.colorScheme.surfaceContainerHigh,
-          borderRadius: BorderRadius.circular(FaiRadius.sm),
+          borderRadius: BorderRadius.circular(ChainRadius.sm),
           border: Border.all(color: theme.colorScheme.outlineVariant),
         ),
         child: MarkdownBody(
@@ -89,16 +89,16 @@ class _TextView extends StatelessWidget {
               await SystemActions.openInOs(href);
             }
           },
-          styleSheet: FaiTheme.markdownStyle(theme),
+          styleSheet: ChainTheme.markdownStyle(theme),
         ),
       );
     }
     return Container(
       width: double.infinity,
-      padding: const EdgeInsets.all(FaiSpace.md),
+      padding: const EdgeInsets.all(ChainSpace.md),
       decoration: BoxDecoration(
         color: theme.colorScheme.surfaceContainerHigh,
-        borderRadius: BorderRadius.circular(FaiRadius.sm),
+        borderRadius: BorderRadius.circular(ChainRadius.sm),
         border: Border.all(color: theme.colorScheme.outlineVariant),
       ),
       child: SelectableText(
@@ -119,15 +119,15 @@ class _CodeBlock extends StatelessWidget {
   Widget build(BuildContext context) {
     return Container(
       width: double.infinity,
-      padding: const EdgeInsets.all(FaiSpace.md),
+      padding: const EdgeInsets.all(ChainSpace.md),
       decoration: BoxDecoration(
         color: theme.colorScheme.surfaceContainerHigh,
-        borderRadius: BorderRadius.circular(FaiRadius.sm),
+        borderRadius: BorderRadius.circular(ChainRadius.sm),
         border: Border.all(color: theme.colorScheme.outlineVariant),
       ),
       child: SelectableText(
         text,
-        style: FaiTheme.mono(size: 12, color: theme.colorScheme.onSurface),
+        style: ChainTheme.mono(size: 12, color: theme.colorScheme.onSurface),
       ),
     );
   }
@@ -183,10 +183,10 @@ class _BytesView extends StatelessWidget {
     final l = AppLocalizations.of(context)!;
     return Container(
       width: double.infinity,
-      padding: const EdgeInsets.all(FaiSpace.md),
+      padding: const EdgeInsets.all(ChainSpace.md),
       decoration: BoxDecoration(
         color: theme.colorScheme.surfaceContainerHigh,
-        borderRadius: BorderRadius.circular(FaiRadius.sm),
+        borderRadius: BorderRadius.circular(ChainRadius.sm),
         border: Border.all(color: theme.colorScheme.outlineVariant),
       ),
       child: Column(
@@ -196,11 +196,11 @@ class _BytesView extends StatelessWidget {
             ConstrainedBox(
               constraints: const BoxConstraints(maxHeight: 240),
               child: ClipRRect(
-                borderRadius: BorderRadius.circular(FaiRadius.sm),
+                borderRadius: BorderRadius.circular(ChainRadius.sm),
                 child: Image.memory(bytes, fit: BoxFit.contain),
               ),
             ),
-            const SizedBox(height: FaiSpace.sm),
+            const SizedBox(height: ChainSpace.sm),
           ],
           Text(
             '${mimeType.isEmpty ? l.flowsOutputBytesUnknownMime : mimeType}'
@@ -209,7 +209,7 @@ class _BytesView extends StatelessWidget {
               color: theme.colorScheme.onSurfaceVariant,
             ),
           ),
-          const SizedBox(height: FaiSpace.sm),
+          const SizedBox(height: ChainSpace.sm),
           OutlinedButton.icon(
             icon: const Icon(Icons.save_alt, size: 16),
             label: Text(l.flowsOutputSaveAs),
@@ -247,10 +247,10 @@ class _FileView extends StatelessWidget {
     final l = AppLocalizations.of(context)!;
     return Container(
       width: double.infinity,
-      padding: const EdgeInsets.all(FaiSpace.md),
+      padding: const EdgeInsets.all(ChainSpace.md),
       decoration: BoxDecoration(
         color: theme.colorScheme.surfaceContainerHigh,
-        borderRadius: BorderRadius.circular(FaiRadius.sm),
+        borderRadius: BorderRadius.circular(ChainRadius.sm),
         border: Border.all(color: theme.colorScheme.outlineVariant),
       ),
       child: Column(
@@ -258,7 +258,7 @@ class _FileView extends StatelessWidget {
         children: [
           SelectableText(
             uri,
-            style: FaiTheme.mono(size: 11, color: theme.colorScheme.primary),
+            style: ChainTheme.mono(size: 11, color: theme.colorScheme.primary),
           ),
           if (mimeType.isNotEmpty) ...[
             const SizedBox(height: 4),
@@ -269,7 +269,7 @@ class _FileView extends StatelessWidget {
               ),
             ),
           ],
-          const SizedBox(height: FaiSpace.sm),
+          const SizedBox(height: ChainSpace.sm),
           OutlinedButton.icon(
             icon: const Icon(Icons.open_in_new, size: 16),
             label: Text(l.flowsOutputOpen),
diff --git a/lib/widgets/fai_log_viewer.dart b/lib/widgets/chain_log_viewer.dart
similarity index 93%
rename from lib/widgets/fai_log_viewer.dart
rename to lib/widgets/chain_log_viewer.dart
index e20451d..c86ad18 100644
--- a/lib/widgets/fai_log_viewer.dart
+++ b/lib/widgets/chain_log_viewer.dart
@@ -1,4 +1,4 @@
-// FaiLogViewer — modal sheet that renders a log file inline with
+// ChainLogViewer — modal sheet that renders a log file inline with
 // line numbers, basic syntax colouring and a Copy-all button.
 //
 // Use [showFaiLogViewer] to open it. Two log shapes are supported
@@ -9,7 +9,7 @@
 //     anything else renders neutral.
 //   - tracing text (the daemon's `~/.chain/run/<channel>.log`):
 //     `[INFO]`, `[WARN]`, `[ERROR]`, `[DEBUG]` substrings get the
-//     matching tone from the FaiTheme palette.
+//     matching tone from the ChainTheme palette.
 //
 // The viewer reads the *last* N lines (default 500) to keep
 // rendering snappy on huge log files. A Refresh button re-reads
@@ -42,7 +42,7 @@ Future<void> showFaiLogViewer(
   return showDialog<void>(
     context: context,
     barrierDismissible: true,
-    builder: (_) => FaiLogViewer(
+    builder: (_) => ChainLogViewer(
       path: path,
       title: title ?? path.split(Platform.pathSeparator).last,
       tailLines: tailLines,
@@ -72,7 +72,7 @@ Future<void> showFaiConfigViewer(
   );
 }
 
-class FaiLogViewer extends StatefulWidget {
+class ChainLogViewer extends StatefulWidget {
   final String path;
   final String title;
   final int tailLines;
@@ -84,7 +84,7 @@ class FaiLogViewer extends StatefulWidget {
   /// (for config / plain-text files).
   final bool plain;
 
-  const FaiLogViewer({
+  const ChainLogViewer({
     super.key,
     required this.path,
     required this.title,
@@ -94,10 +94,10 @@ class FaiLogViewer extends StatefulWidget {
   });
 
   @override
-  State<FaiLogViewer> createState() => _FaiLogViewerState();
+  State<ChainLogViewer> createState() => _FaiLogViewerState();
 }
 
-class _FaiLogViewerState extends State<FaiLogViewer> {
+class _FaiLogViewerState extends State<ChainLogViewer> {
   List<String> _lines = const <String>[];
   bool _loading = true;
   bool _justCopied = false;
@@ -141,8 +141,8 @@ class _FaiLogViewerState extends State<FaiLogViewer> {
     final l = AppLocalizations.of(context)!;
     return Dialog(
       insetPadding: const EdgeInsets.symmetric(
-        horizontal: FaiSpace.xl,
-        vertical: FaiSpace.xl,
+        horizontal: ChainSpace.xl,
+        vertical: ChainSpace.xl,
       ),
       child: ConstrainedBox(
         constraints: const BoxConstraints(maxWidth: 980, maxHeight: 720),
@@ -169,7 +169,7 @@ class _FaiLogViewerState extends State<FaiLogViewer> {
                   : _lines.isEmpty
                   ? Center(
                       child: Padding(
-                        padding: const EdgeInsets.all(FaiSpace.xl),
+                        padding: const EdgeInsets.all(ChainSpace.xl),
                         child: Text(
                           l.logViewerEmpty,
                           style: theme.textTheme.bodySmall?.copyWith(
@@ -218,10 +218,10 @@ class _Header extends StatelessWidget {
     final l = AppLocalizations.of(context)!;
     return Padding(
       padding: const EdgeInsets.fromLTRB(
-        FaiSpace.lg,
-        FaiSpace.md,
-        FaiSpace.sm,
-        FaiSpace.md,
+        ChainSpace.lg,
+        ChainSpace.md,
+        ChainSpace.sm,
+        ChainSpace.md,
       ),
       child: Row(
         children: [
@@ -230,7 +230,7 @@ class _Header extends StatelessWidget {
             size: 18,
             color: theme.colorScheme.onSurfaceVariant,
           ),
-          const SizedBox(width: FaiSpace.sm),
+          const SizedBox(width: ChainSpace.sm),
           Expanded(
             child: Column(
               crossAxisAlignment: CrossAxisAlignment.start,
@@ -246,7 +246,7 @@ class _Header extends StatelessWidget {
                 const SizedBox(height: 2),
                 Text(
                   '$path · ${l.logViewerLineCount(lineCount)}',
-                  style: FaiTheme.mono(
+                  style: ChainTheme.mono(
                     size: 10,
                     color: theme.colorScheme.onSurfaceVariant,
                   ),
@@ -296,7 +296,7 @@ class _LogBody extends StatelessWidget {
     final gutterWidth = 12.0 + 8.0 * lines.length.toString().length;
     return Scrollbar(
       child: ListView.builder(
-        padding: const EdgeInsets.symmetric(vertical: FaiSpace.sm),
+        padding: const EdgeInsets.symmetric(vertical: ChainSpace.sm),
         itemCount: lines.length,
         itemBuilder: (context, i) => _LogLine(
           lineNumber: i + 1,
@@ -328,7 +328,7 @@ class _LogLine extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     return Padding(
-      padding: const EdgeInsets.symmetric(horizontal: FaiSpace.sm, vertical: 1),
+      padding: const EdgeInsets.symmetric(horizontal: ChainSpace.sm, vertical: 1),
       child: Row(
         crossAxisAlignment: CrossAxisAlignment.start,
         children: [
@@ -337,7 +337,7 @@ class _LogLine extends StatelessWidget {
             child: Text(
               '$lineNumber',
               textAlign: TextAlign.right,
-              style: FaiTheme.mono(
+              style: ChainTheme.mono(
                 size: 11,
                 color: theme.colorScheme.onSurfaceVariant.withValues(
                   alpha: 0.6,
@@ -345,7 +345,7 @@ class _LogLine extends StatelessWidget {
               ),
             ),
           ),
-          const SizedBox(width: FaiSpace.sm),
+          const SizedBox(width: ChainSpace.sm),
           Expanded(
             child: SelectableText.rich(
               plain
@@ -354,7 +354,7 @@ class _LogLine extends StatelessWidget {
                       style: TextStyle(color: theme.colorScheme.onSurface),
                     )
                   : _highlightLine(text, theme),
-              style: FaiTheme.mono(
+              style: ChainTheme.mono(
                 size: 11,
                 color: theme.colorScheme.onSurface,
               ),
@@ -388,7 +388,7 @@ TextSpan _highlightJsonLine(String line, ThemeData theme) {
     color: theme.colorScheme.primary,
     fontWeight: FontWeight.w600,
   );
-  final stringStyle = TextStyle(color: FaiColors.success);
+  final stringStyle = TextStyle(color: ChainColors.success);
   final errorStringStyle = TextStyle(color: theme.colorScheme.error);
 
   final keyRe = RegExp(r'"(ts|level|source|error|context)"\s*:');
@@ -440,7 +440,7 @@ TextSpan _highlightTraceLine(String line, ThemeData theme) {
       break;
     case 'WARN':
     case 'WARNING':
-      tone = FaiColors.warning;
+      tone = ChainColors.warning;
       break;
     case 'INFO':
       tone = theme.colorScheme.primary;
diff --git a/lib/widgets/fai_module_sheet.dart b/lib/widgets/chain_module_sheet.dart
similarity index 89%
rename from lib/widgets/fai_module_sheet.dart
rename to lib/widgets/chain_module_sheet.dart
index 5ae7d36..5c63740 100644
--- a/lib/widgets/fai_module_sheet.dart
+++ b/lib/widgets/chain_module_sheet.dart
@@ -1,4 +1,4 @@
-// FaiModuleSheet — modal bottom-sheet showing detailed module
+// ChainModuleSheet — modal bottom-sheet showing detailed module
 // info: full capability list, declared permissions, on-disk
 // directory. Opened by tapping a module card on the Modules
 // page.
@@ -11,12 +11,12 @@ import '../l10n/app_localizations.dart';
 import '../pages/welcome.dart' show showFaiDoc;
 import '../theme/theme.dart';
 import '../theme/tokens.dart';
-import 'fai_pill.dart';
+import 'chain_pill.dart';
 
-class FaiModuleSheet extends StatefulWidget {
+class ChainModuleSheet extends StatefulWidget {
   final String moduleName;
 
-  const FaiModuleSheet({super.key, required this.moduleName});
+  const ChainModuleSheet({super.key, required this.moduleName});
 
   /// Convenience launcher used from the Modules list. Resolves
   /// to `true` when the operator uninstalled the module — the
@@ -28,18 +28,18 @@ class FaiModuleSheet extends StatefulWidget {
       isScrollControlled: true,
       elevation: 8,
       shape: const RoundedRectangleBorder(
-        borderRadius: BorderRadius.vertical(top: Radius.circular(FaiRadius.md)),
+        borderRadius: BorderRadius.vertical(top: Radius.circular(ChainRadius.md)),
       ),
-      builder: (_) => FaiModuleSheet(moduleName: name),
+      builder: (_) => ChainModuleSheet(moduleName: name),
     );
     return r ?? false;
   }
 
   @override
-  State<FaiModuleSheet> createState() => _FaiModuleSheetState();
+  State<ChainModuleSheet> createState() => _FaiModuleSheetState();
 }
 
-class _FaiModuleSheetState extends State<FaiModuleSheet> {
+class _FaiModuleSheetState extends State<ChainModuleSheet> {
   late final Future<ModuleDetail> _future;
   bool _uninstalling = false;
 
@@ -127,12 +127,12 @@ class _FaiModuleSheetState extends State<FaiModuleSheet> {
               _Handle(),
               if (snapshot.connectionState == ConnectionState.waiting)
                 const Padding(
-                  padding: EdgeInsets.all(FaiSpace.xxxl),
+                  padding: EdgeInsets.all(ChainSpace.xxxl),
                   child: CircularProgressIndicator(),
                 )
               else if (snapshot.hasError)
                 Padding(
-                  padding: const EdgeInsets.all(FaiSpace.xl),
+                  padding: const EdgeInsets.all(ChainSpace.xl),
                   child: Text(
                     AppLocalizations.of(
                       context,
@@ -163,7 +163,7 @@ class _Handle extends StatelessWidget {
   Widget build(BuildContext context) {
     final theme = Theme.of(context);
     return Padding(
-      padding: const EdgeInsets.symmetric(vertical: FaiSpace.sm),
+      padding: const EdgeInsets.symmetric(vertical: ChainSpace.sm),
       child: Container(
         width: 40,
         height: 4,
@@ -193,10 +193,10 @@ class _Body extends StatelessWidget {
     final l = AppLocalizations.of(context)!;
     return ListView(
       padding: const EdgeInsets.fromLTRB(
-        FaiSpace.xxl,
-        FaiSpace.md,
-        FaiSpace.xxl,
-        FaiSpace.xxl,
+        ChainSpace.xxl,
+        ChainSpace.md,
+        ChainSpace.xxl,
+        ChainSpace.xxl,
       ),
       shrinkWrap: true,
       children: [
@@ -208,39 +208,39 @@ class _Body extends StatelessWidget {
                 fontWeight: FontWeight.w600,
               ),
             ),
-            const SizedBox(width: FaiSpace.md),
-            FaiPill(
+            const SizedBox(width: ChainSpace.md),
+            ChainPill(
               label: 'v${detail.version}',
-              tone: FaiPillTone.accent,
+              tone: ChainPillTone.accent,
               monospace: true,
             ),
           ],
         ),
-        const SizedBox(height: FaiSpace.xs),
+        const SizedBox(height: ChainSpace.xs),
         SelectableText(
           detail.directory,
-          style: FaiTheme.mono(
+          style: ChainTheme.mono(
             size: 11,
             color: theme.colorScheme.onSurfaceVariant,
           ),
         ),
-        const SizedBox(height: FaiSpace.xl),
+        const SizedBox(height: ChainSpace.xl),
         _SectionHeader(l.moduleSheetCapabilities),
-        const SizedBox(height: FaiSpace.sm),
+        const SizedBox(height: ChainSpace.sm),
         Wrap(
-          spacing: FaiSpace.xs,
-          runSpacing: FaiSpace.xs,
+          spacing: ChainSpace.xs,
+          runSpacing: ChainSpace.xs,
           children: detail.capabilities
               .map(
-                (c) => FaiPill(
+                (c) => ChainPill(
                   label: c,
-                  tone: FaiPillTone.accent,
+                  tone: ChainPillTone.accent,
                   monospace: true,
                 ),
               )
               .toList(),
         ),
-        const SizedBox(height: FaiSpace.xl),
+        const SizedBox(height: ChainSpace.xl),
         Row(
           children: [
             _SectionHeader(l.moduleSheetPermissions),
@@ -259,7 +259,7 @@ class _Body extends StatelessWidget {
             ),
           ],
         ),
-        const SizedBox(height: FaiSpace.sm),
+        const SizedBox(height: ChainSpace.sm),
         if (detail.permissions.isEmpty)
           Text(
             l.moduleSheetNoPermissions,
@@ -282,10 +282,10 @@ class _Body extends StatelessWidget {
                           size: 14,
                           color: theme.colorScheme.onSurfaceVariant,
                         ),
-                        const SizedBox(width: FaiSpace.sm),
+                        const SizedBox(width: ChainSpace.sm),
                         SelectableText(
                           p,
-                          style: FaiTheme.mono(
+                          style: ChainTheme.mono(
                             size: 12,
                             color: theme.colorScheme.onSurface,
                           ),
@@ -296,7 +296,7 @@ class _Body extends StatelessWidget {
                 )
                 .toList(),
           ),
-        const SizedBox(height: FaiSpace.xxl),
+        const SizedBox(height: ChainSpace.xxl),
         Row(
           children: [
             const Spacer(),
@@ -378,7 +378,7 @@ class _UninstallVersionPickerDialogState
         mainAxisSize: MainAxisSize.min,
         children: [
           Text(l.uninstallVersionPickerBody(widget.moduleName)),
-          const SizedBox(height: FaiSpace.md),
+          const SizedBox(height: ChainSpace.md),
           RadioGroup<String>(
             groupValue: _picked,
             onChanged: (val) {
diff --git a/lib/widgets/fai_pill.dart b/lib/widgets/chain_pill.dart
similarity index 63%
rename from lib/widgets/fai_pill.dart
rename to lib/widgets/chain_pill.dart
index 2ab2261..24f73b7 100644
--- a/lib/widgets/fai_pill.dart
+++ b/lib/widgets/chain_pill.dart
@@ -1,4 +1,4 @@
-// FaiPill — small inline label. Used for capabilities, versions,
+// ChainPill — small inline label. Used for capabilities, versions,
 // permission scopes, status text. Replaces ad-hoc Container chips.
 
 import 'package:flutter/material.dart';
@@ -6,18 +6,18 @@ import 'package:flutter/material.dart';
 import '../theme/theme.dart';
 import '../theme/tokens.dart';
 
-enum FaiPillTone { neutral, accent, success, warning, danger }
+enum ChainPillTone { neutral, accent, success, warning, danger }
 
-class FaiPill extends StatelessWidget {
+class ChainPill extends StatelessWidget {
   final String label;
-  final FaiPillTone tone;
+  final ChainPillTone tone;
   final IconData? icon;
   final bool monospace;
 
-  const FaiPill({
+  const ChainPill({
     super.key,
     required this.label,
-    this.tone = FaiPillTone.neutral,
+    this.tone = ChainPillTone.neutral,
     this.icon,
     this.monospace = false,
   });
@@ -27,13 +27,13 @@ class FaiPill extends StatelessWidget {
     final theme = Theme.of(context);
     final (bg, fg) = _colors(theme.colorScheme);
     final textStyle = monospace
-        ? FaiTheme.mono(size: 11, weight: FontWeight.w500, color: fg)
+        ? ChainTheme.mono(size: 11, weight: FontWeight.w500, color: fg)
         : theme.textTheme.labelSmall?.copyWith(color: fg);
     return Container(
-      padding: const EdgeInsets.symmetric(horizontal: FaiSpace.sm, vertical: 3),
+      padding: const EdgeInsets.symmetric(horizontal: ChainSpace.sm, vertical: 3),
       decoration: BoxDecoration(
         color: bg,
-        borderRadius: BorderRadius.circular(FaiRadius.sm),
+        borderRadius: BorderRadius.circular(ChainRadius.sm),
       ),
       child: Row(
         mainAxisSize: MainAxisSize.min,
@@ -50,25 +50,25 @@ class FaiPill extends StatelessWidget {
 
   (Color, Color) _colors(ColorScheme scheme) {
     switch (tone) {
-      case FaiPillTone.neutral:
+      case ChainPillTone.neutral:
         return (scheme.surfaceContainerHighest, scheme.onSurfaceVariant);
-      case FaiPillTone.accent:
+      case ChainPillTone.accent:
         return (scheme.primary.withValues(alpha: 0.15), scheme.primary);
-      case FaiPillTone.success:
+      case ChainPillTone.success:
         return (
-          FaiColors.success.withValues(alpha: 0.15),
+          ChainColors.success.withValues(alpha: 0.15),
           scheme.brightness == Brightness.dark
-              ? FaiColors.success
+              ? ChainColors.success
               : const Color(0xFF15803D),
         );
-      case FaiPillTone.warning:
+      case ChainPillTone.warning:
         return (
-          FaiColors.warning.withValues(alpha: 0.15),
+          ChainColors.warning.withValues(alpha: 0.15),
           scheme.brightness == Brightness.dark
-              ? FaiColors.warning
+              ? ChainColors.warning
               : const Color(0xFFB45309),
         );
-      case FaiPillTone.danger:
+      case ChainPillTone.danger:
         return (scheme.errorContainer, scheme.onErrorContainer);
     }
   }
diff --git a/lib/widgets/fai_search_palette.dart b/lib/widgets/chain_search_palette.dart
similarity index 94%
rename from lib/widgets/fai_search_palette.dart
rename to lib/widgets/chain_search_palette.dart
index 776b3bb..0a0dc8e 100644
--- a/lib/widgets/fai_search_palette.dart
+++ b/lib/widgets/chain_search_palette.dart
@@ -1,4 +1,4 @@
-// FaiSearchPalette — global Cmd+K command bar.
+// ChainSearchPalette — global Cmd+K command bar.
 //
 // Indexes: nav destinations, installed modules, store entries,
 // saved flows. Filters client-side as the operator types.
@@ -12,12 +12,12 @@ import 'package:flutter/services.dart';
 
 import '../data/hub.dart';
 import '../l10n/app_localizations.dart';
-import 'fai_module_sheet.dart';
+import 'chain_module_sheet.dart';
 
 /// One row in the palette. Carries everything needed to render
 /// + dispatch — keep it serializable-shaped so we can persist
 /// recent picks later.
-class FaiSearchHit {
+class ChainSearchHit {
   final String label;
   final String hint;
   final IconData icon;
@@ -33,7 +33,7 @@ class FaiSearchHit {
   /// Action to run when this hit is selected.
   final VoidCallback onSelect;
 
-  FaiSearchHit({
+  ChainSearchHit({
     required this.label,
     required this.hint,
     required this.icon,
@@ -42,33 +42,33 @@ class FaiSearchHit {
   }) : haystack = '$label $hint $group'.toLowerCase();
 }
 
-class FaiSearchPalette extends StatefulWidget {
+class ChainSearchPalette extends StatefulWidget {
   /// Pages the operator can navigate to. Each entry maps to a
   /// callback that selects the right tab back in the shell.
-  final List<FaiSearchHit> staticHits;
+  final List<ChainSearchHit> staticHits;
 
-  const FaiSearchPalette({super.key, required this.staticHits});
+  const ChainSearchPalette({super.key, required this.staticHits});
 
   /// Convenience launcher — used from the Cmd+K shortcut.
   static Future<void> show(
     BuildContext context, {
-    required List<FaiSearchHit> staticHits,
+    required List<ChainSearchHit> staticHits,
   }) {
     return showDialog<void>(
       context: context,
       barrierColor: Colors.black54,
-      builder: (_) => FaiSearchPalette(staticHits: staticHits),
+      builder: (_) => ChainSearchPalette(staticHits: staticHits),
     );
   }
 
   @override
-  State<FaiSearchPalette> createState() => _FaiSearchPaletteState();
+  State<ChainSearchPalette> createState() => _FaiSearchPaletteState();
 }
 
-class _FaiSearchPaletteState extends State<FaiSearchPalette> {
+class _FaiSearchPaletteState extends State<ChainSearchPalette> {
   final _query = TextEditingController();
   final _focus = FocusNode();
-  Future<List<FaiSearchHit>>? _dynamicFuture;
+  Future<List<ChainSearchHit>>? _dynamicFuture;
   int _highlight = 0;
 
   @override
@@ -92,7 +92,7 @@ class _FaiSearchPaletteState extends State<FaiSearchPalette> {
   /// Pull modules / store / flows in parallel so the palette
   /// is searchable as soon as the operator finishes typing the
   /// first character.
-  Future<List<FaiSearchHit>> _loadDynamic() async {
+  Future<List<ChainSearchHit>> _loadDynamic() async {
     final svc = HubService.instance;
     final l = AppLocalizations.of(context)!;
     final results = await Future.wait([
@@ -104,17 +104,17 @@ class _FaiSearchPaletteState extends State<FaiSearchPalette> {
     final store = results[1] as List<StoreItem>;
     final flows = results[2] as List<SavedFlow>;
 
-    final hits = <FaiSearchHit>[];
+    final hits = <ChainSearchHit>[];
     for (final m in modules) {
       hits.add(
-        FaiSearchHit(
+        ChainSearchHit(
           label: m.name,
           hint: l.searchInstalledModuleHint(m.version),
           icon: Icons.extension,
           group: l.searchGroupModules,
           onSelect: () {
             Navigator.pop(context);
-            FaiModuleSheet.show(context, m.name);
+            ChainModuleSheet.show(context, m.name);
           },
         ),
       );
@@ -123,7 +123,7 @@ class _FaiSearchPaletteState extends State<FaiSearchPalette> {
     final pagesGroup = l.searchGroupPages;
     for (final s in store) {
       hits.add(
-        FaiSearchHit(
+        ChainSearchHit(
           label: s.name,
           hint: s.taglineEn.isEmpty
               ? l.searchStoreHintWithCategory(
@@ -151,7 +151,7 @@ class _FaiSearchPaletteState extends State<FaiSearchPalette> {
     final flowsGroup = l.searchGroupFlows;
     for (final f in flows) {
       hits.add(
-        FaiSearchHit(
+        ChainSearchHit(
           label: f.name,
           hint: l.searchSavedFlowHint,
           icon: Icons.account_tree_outlined,
@@ -174,11 +174,11 @@ class _FaiSearchPaletteState extends State<FaiSearchPalette> {
   /// Filtered + grouped result list. Empty query returns the
   /// pages first then everything else, capped to 50 rows so the
   /// dialog stays scrollable.
-  List<FaiSearchHit> _resultsFor(List<FaiSearchHit> dynamic_, String raw) {
+  List<ChainSearchHit> _resultsFor(List<ChainSearchHit> dynamic_, String raw) {
     final query = raw.trim().toLowerCase();
     final all = [...widget.staticHits, ...dynamic_];
     if (query.isEmpty) return all.take(50).toList();
-    final scored = <(int, FaiSearchHit)>[];
+    final scored = <(int, ChainSearchHit)>[];
     for (final h in all) {
       final i = h.haystack.indexOf(query);
       if (i < 0) continue;
@@ -224,10 +224,10 @@ class _FaiSearchPaletteState extends State<FaiSearchPalette> {
       shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(12)),
       child: ConstrainedBox(
         constraints: const BoxConstraints(maxWidth: 640, maxHeight: 540),
-        child: FutureBuilder<List<FaiSearchHit>>(
+        child: FutureBuilder<List<ChainSearchHit>>(
           future: _dynamicFuture,
           builder: (context, snap) {
-            final dyn = snap.data ?? const <FaiSearchHit>[];
+            final dyn = snap.data ?? const <ChainSearchHit>[];
             return ValueListenableBuilder<TextEditingValue>(
               valueListenable: _query,
               builder: (_, value, _) {
diff --git a/lib/widgets/fai_settings_dialog.dart b/lib/widgets/chain_settings_dialog.dart
similarity index 93%
rename from lib/widgets/fai_settings_dialog.dart
rename to lib/widgets/chain_settings_dialog.dart
index 3910507..b94b58d 100644
--- a/lib/widgets/fai_settings_dialog.dart
+++ b/lib/widgets/chain_settings_dialog.dart
@@ -1,4 +1,4 @@
-// FaiSettingsDialog — modal for changing the hub endpoint.
+// ChainSettingsDialog — modal for changing the hub endpoint.
 // Reads current values from HubService, persists on save via
 // HubService.reconnect.
 
@@ -14,25 +14,25 @@ import '../l10n/app_localizations.dart';
 import '../pages/welcome.dart' show showFaiDoc;
 import '../theme/theme.dart';
 import '../theme/tokens.dart';
-import 'fai_error_box.dart';
-import 'fai_pill.dart';
-import 'fai_system_ai_editor.dart';
+import 'chain_error_box.dart';
+import 'chain_pill.dart';
+import 'chain_system_ai_editor.dart';
 import 'theme_picker_grid.dart';
 
-class FaiSettingsDialog extends StatefulWidget {
-  const FaiSettingsDialog({super.key});
+class ChainSettingsDialog extends StatefulWidget {
+  const ChainSettingsDialog({super.key});
 
   /// Convenience launcher used from the sidebar gear icon.
   static Future<bool> show(BuildContext context) async {
     final ok = await showDialog<bool>(
       context: context,
-      builder: (_) => const FaiSettingsDialog(),
+      builder: (_) => const ChainSettingsDialog(),
     );
     return ok ?? false;
   }
 
   @override
-  State<FaiSettingsDialog> createState() => _FaiSettingsDialogState();
+  State<ChainSettingsDialog> createState() => _FaiSettingsDialogState();
 }
 
 /// Sidebar categories — every Settings panel belongs to exactly
@@ -40,7 +40,7 @@ class FaiSettingsDialog extends StatefulWidget {
 /// first-opened category.
 enum _Category { general, appearance, ai, integrations, security, maintenance }
 
-class _FaiSettingsDialogState extends State<FaiSettingsDialog> {
+class _FaiSettingsDialogState extends State<ChainSettingsDialog> {
   late final TextEditingController _host;
   late final TextEditingController _port;
   bool _secure = false;
@@ -291,7 +291,7 @@ class _FaiSettingsDialogState extends State<FaiSettingsDialog> {
       _saving = true;
       _channelToast = null;
     });
-    final r = await SystemActions.faiChannelSwitch(name);
+    final r = await SystemActions.chainChannelSwitch(name);
     if (!mounted) return;
     final l = AppLocalizations.of(context)!;
     setState(() {
@@ -384,10 +384,10 @@ class _FaiSettingsDialogState extends State<FaiSettingsDialog> {
     };
     return SingleChildScrollView(
       padding: const EdgeInsets.fromLTRB(
-        FaiSpace.xl,
-        FaiSpace.xl,
-        FaiSpace.xl,
-        FaiSpace.lg,
+        ChainSpace.xl,
+        ChainSpace.xl,
+        ChainSpace.xl,
+        ChainSpace.lg,
       ),
       child: Column(
         crossAxisAlignment: CrossAxisAlignment.start,
@@ -403,7 +403,7 @@ class _FaiSettingsDialogState extends State<FaiSettingsDialog> {
     String? docSlug,
   }) {
     return Padding(
-      padding: const EdgeInsets.only(bottom: FaiSpace.lg),
+      padding: const EdgeInsets.only(bottom: ChainSpace.lg),
       child: Column(
         crossAxisAlignment: CrossAxisAlignment.start,
         children: [
@@ -455,7 +455,7 @@ class _FaiSettingsDialogState extends State<FaiSettingsDialog> {
         ),
         autofocus: true,
       ),
-      const SizedBox(height: FaiSpace.md),
+      const SizedBox(height: ChainSpace.md),
       Row(
         children: [
           Expanded(
@@ -470,7 +470,7 @@ class _FaiSettingsDialogState extends State<FaiSettingsDialog> {
               keyboardType: TextInputType.number,
             ),
           ),
-          const SizedBox(width: FaiSpace.md),
+          const SizedBox(width: ChainSpace.md),
           Expanded(
             flex: 3,
             child: SwitchListTile(
@@ -490,7 +490,7 @@ class _FaiSettingsDialogState extends State<FaiSettingsDialog> {
         ],
       ),
       if (_error != null) ...[
-        const SizedBox(height: FaiSpace.md),
+        const SizedBox(height: ChainSpace.md),
         Text(
           _error!,
           style: theme.textTheme.bodySmall?.copyWith(
@@ -498,12 +498,12 @@ class _FaiSettingsDialogState extends State<FaiSettingsDialog> {
           ),
         ),
       ],
-      const SizedBox(height: FaiSpace.md),
+      const SizedBox(height: ChainSpace.md),
       Container(
-        padding: const EdgeInsets.all(FaiSpace.sm),
+        padding: const EdgeInsets.all(ChainSpace.sm),
         decoration: BoxDecoration(
           color: theme.colorScheme.surfaceContainerHigh,
-          borderRadius: BorderRadius.circular(FaiRadius.sm),
+          borderRadius: BorderRadius.circular(ChainRadius.sm),
         ),
         child: Row(
           children: [
@@ -512,10 +512,10 @@ class _FaiSettingsDialogState extends State<FaiSettingsDialog> {
               size: 14,
               color: theme.colorScheme.onSurfaceVariant,
             ),
-            const SizedBox(width: FaiSpace.sm),
+            const SizedBox(width: ChainSpace.sm),
             Text(
               _previewUrl(),
-              style: FaiTheme.mono(
+              style: ChainTheme.mono(
                 size: 11,
                 color: theme.colorScheme.onSurface,
               ),
@@ -524,7 +524,7 @@ class _FaiSettingsDialogState extends State<FaiSettingsDialog> {
         ),
       ),
       if (_channels != null) ...[
-        const SizedBox(height: FaiSpace.xl),
+        const SizedBox(height: ChainSpace.xl),
         Text(
           l.channelsHeader,
           style: theme.textTheme.labelSmall?.copyWith(
@@ -540,7 +540,7 @@ class _FaiSettingsDialogState extends State<FaiSettingsDialog> {
             color: theme.colorScheme.onSurfaceVariant,
           ),
         ),
-        const SizedBox(height: FaiSpace.sm),
+        const SizedBox(height: ChainSpace.sm),
         for (final ch in _channels!.channels)
           _ChannelRow(
             channel: ch,
@@ -551,21 +551,21 @@ class _FaiSettingsDialogState extends State<FaiSettingsDialog> {
                 ? null
                 : () => _runDaemon(
                     l.daemonActionEnableAutostart,
-                    () => SystemActions.faiDaemonEnable(ch.name),
+                    () => SystemActions.chainDaemonEnable(ch.name),
                   ),
             onDisableAutostart: _saving
                 ? null
                 : () => _runDaemon(
                     l.daemonActionDisableAutostart,
-                    () => SystemActions.faiDaemonDisable(ch.name),
+                    () => SystemActions.chainDaemonDisable(ch.name),
                   ),
           ),
         if (_channelToast != null) ...[
-          const SizedBox(height: FaiSpace.sm),
-          FaiErrorBox(text: _channelToast!, maxHeight: 200),
+          const SizedBox(height: ChainSpace.sm),
+          ChainErrorBox(text: _channelToast!, maxHeight: 200),
         ],
       ],
-      const SizedBox(height: FaiSpace.xl),
+      const SizedBox(height: ChainSpace.xl),
       const _DefaultScopePanel(),
     ];
   }
@@ -594,7 +594,7 @@ class _FaiSettingsDialogState extends State<FaiSettingsDialog> {
         _SystemAiPanel(
           status: _aiStatus!,
           onEdit: () async {
-            final updated = await FaiSystemAiEditor.show(context, _aiStatus!);
+            final updated = await ChainSystemAiEditor.show(context, _aiStatus!);
             if (updated != null && mounted) {
               setState(() => _aiStatus = updated);
             }
@@ -612,7 +612,7 @@ class _FaiSettingsDialogState extends State<FaiSettingsDialog> {
       ),
       if (_mcpClients == null)
         const Padding(
-          padding: EdgeInsets.symmetric(vertical: FaiSpace.md),
+          padding: EdgeInsets.symmetric(vertical: ChainSpace.md),
           child: Center(child: CircularProgressIndicator(strokeWidth: 2)),
         )
       else
@@ -622,7 +622,7 @@ class _FaiSettingsDialogState extends State<FaiSettingsDialog> {
           onRemove: _removeMcpClient,
           onRefresh: _refreshMcpClients,
         ),
-      const SizedBox(height: FaiSpace.xl),
+      const SizedBox(height: ChainSpace.xl),
       if (_n8nEndpoints != null)
         _N8nEndpointsPanel(
           endpoints: _n8nEndpoints!,
@@ -646,7 +646,7 @@ class _FaiSettingsDialogState extends State<FaiSettingsDialog> {
         onSave: _saveRegistryToken,
         onClear: _clearRegistryToken,
       ),
-      const SizedBox(height: FaiSpace.xl),
+      const SizedBox(height: ChainSpace.xl),
       _HubAuthTokenPanel(
         configuredChars: _hubAuthTokenChars,
         onSave: _saveHubAuthToken,
@@ -686,7 +686,7 @@ class _FaiSettingsDialogState extends State<FaiSettingsDialog> {
     return AlertDialog(
       title: Text(l.settingsTitle),
       shape: RoundedRectangleBorder(
-        borderRadius: BorderRadius.circular(FaiRadius.md),
+        borderRadius: BorderRadius.circular(ChainRadius.md),
       ),
       contentPadding: EdgeInsets.zero,
       content: ConstrainedBox(
@@ -770,15 +770,15 @@ class _ChannelRow extends StatelessWidget {
             channel.running ? Icons.circle : Icons.circle_outlined,
             size: 10,
             color: channel.running
-                ? FaiColors.success
+                ? ChainColors.success
                 : theme.colorScheme.outline,
           ),
-          const SizedBox(width: FaiSpace.sm),
+          const SizedBox(width: ChainSpace.sm),
           SizedBox(
             width: 88,
             child: Text(
               channel.name,
-              style: FaiTheme.mono(
+              style: ChainTheme.mono(
                 size: 11,
                 weight: active ? FontWeight.w600 : FontWeight.w400,
                 color: theme.colorScheme.onSurface,
@@ -789,7 +789,7 @@ class _ChannelRow extends StatelessWidget {
             width: 64,
             child: Text(
               ':${channel.port}',
-              style: FaiTheme.mono(
+              style: ChainTheme.mono(
                 size: 11,
                 color: theme.colorScheme.onSurfaceVariant,
               ),
@@ -805,10 +805,10 @@ class _ChannelRow extends StatelessWidget {
           ),
           if (active)
             Padding(
-              padding: const EdgeInsets.only(right: FaiSpace.sm),
-              child: FaiPill(
+              padding: const EdgeInsets.only(right: ChainSpace.sm),
+              child: ChainPill(
                 label: l.channelsActive,
-                tone: FaiPillTone.success,
+                tone: ChainPillTone.success,
               ),
             ),
           PopupMenuButton<String>(
@@ -876,7 +876,7 @@ class _MenuRow extends StatelessWidget {
     return Row(
       children: [
         Icon(icon, size: 14),
-        const SizedBox(width: FaiSpace.sm),
+        const SizedBox(width: ChainSpace.sm),
         Text(text),
       ],
     );
@@ -906,18 +906,18 @@ class _SystemAiPanel extends StatelessWidget {
                 fontSize: 10,
               ),
             ),
-            const SizedBox(width: FaiSpace.sm),
-            FaiPill(
+            const SizedBox(width: ChainSpace.sm),
+            ChainPill(
               label: status.enabled ? l.systemAiEnabled : l.systemAiOff,
-              tone: status.enabled ? FaiPillTone.success : FaiPillTone.neutral,
+              tone: status.enabled ? ChainPillTone.success : ChainPillTone.neutral,
             ),
             if (status.enabled) ...[
-              const SizedBox(width: FaiSpace.xs),
-              FaiPill(
+              const SizedBox(width: ChainSpace.xs),
+              ChainPill(
                 label: status.privacyMode,
                 tone: status.privacyMode == 'full'
-                    ? FaiPillTone.warning
-                    : FaiPillTone.neutral,
+                    ? ChainPillTone.warning
+                    : ChainPillTone.neutral,
               ),
             ],
             const Spacer(),
@@ -985,7 +985,7 @@ class _StatRow extends StatelessWidget {
             child: Text(
               value.isEmpty ? '—' : value,
               style: mono
-                  ? FaiTheme.mono(size: 11, color: theme.colorScheme.onSurface)
+                  ? ChainTheme.mono(size: 11, color: theme.colorScheme.onSurface)
                   : theme.textTheme.bodySmall,
             ),
           ),
@@ -1045,10 +1045,10 @@ class _McpClientsPanel extends StatelessWidget {
                 fontSize: 10,
               ),
             ),
-            const SizedBox(width: FaiSpace.sm),
-            FaiPill(
+            const SizedBox(width: ChainSpace.sm),
+            ChainPill(
               label: l.mcpServersCount(clients.length),
-              tone: FaiPillTone.neutral,
+              tone: ChainPillTone.neutral,
             ),
             const Spacer(),
             IconButton(
@@ -1075,10 +1075,10 @@ class _McpClientsPanel extends StatelessWidget {
             color: theme.colorScheme.onSurfaceVariant,
           ),
         ),
-        const SizedBox(height: FaiSpace.sm),
+        const SizedBox(height: ChainSpace.sm),
         if (clients.isEmpty)
           Padding(
-            padding: const EdgeInsets.symmetric(vertical: FaiSpace.sm),
+            padding: const EdgeInsets.symmetric(vertical: ChainSpace.sm),
             child: Text(
               l.mcpEmpty,
               style: theme.textTheme.bodySmall?.copyWith(
@@ -1105,7 +1105,7 @@ class _McpClientRow extends StatelessWidget {
     final l = AppLocalizations.of(context)!;
     final ok = client.healthy;
     final dotColor = client.errorKind.isEmpty
-        ? (ok ? FaiColors.success : FaiColors.muted)
+        ? (ok ? ChainColors.success : ChainColors.muted)
         : theme.colorScheme.error;
     return Padding(
       padding: const EdgeInsets.symmetric(vertical: 4),
@@ -1116,7 +1116,7 @@ class _McpClientRow extends StatelessWidget {
             padding: const EdgeInsets.only(top: 6),
             child: Icon(Icons.circle, size: 8, color: dotColor),
           ),
-          const SizedBox(width: FaiSpace.sm),
+          const SizedBox(width: ChainSpace.sm),
           Expanded(
             child: Column(
               crossAxisAlignment: CrossAxisAlignment.start,
@@ -1125,28 +1125,28 @@ class _McpClientRow extends StatelessWidget {
                   children: [
                     Text(
                       client.name,
-                      style: FaiTheme.mono(
+                      style: ChainTheme.mono(
                         size: 12,
                         weight: FontWeight.w600,
                         color: theme.colorScheme.onSurface,
                       ),
                     ),
-                    const SizedBox(width: FaiSpace.sm),
+                    const SizedBox(width: ChainSpace.sm),
                     if (client.toolCount > 0)
-                      FaiPill(
+                      ChainPill(
                         label: l.mcpToolsCount(client.toolCount),
-                        tone: FaiPillTone.success,
+                        tone: ChainPillTone.success,
                       )
                     else if (client.errorKind.isNotEmpty)
-                      FaiPill(
+                      ChainPill(
                         label: client.errorKind,
-                        tone: FaiPillTone.danger,
+                        tone: ChainPillTone.danger,
                       ),
                   ],
                 ),
                 Text(
                   client.endpoint,
-                  style: FaiTheme.mono(
+                  style: ChainTheme.mono(
                     size: 10,
                     color: theme.colorScheme.onSurfaceVariant,
                   ),
@@ -1234,7 +1234,7 @@ class _AddMcpClientDialogState extends State<_AddMcpClientDialog> {
                 color: theme.colorScheme.onSurfaceVariant,
               ),
             ),
-            const SizedBox(height: FaiSpace.md),
+            const SizedBox(height: ChainSpace.md),
             // Curated suggestions from the official Anthropic
             // MCP servers + a few community staples. Click a
             // chip to pre-fill the form. The operator still
@@ -1249,8 +1249,8 @@ class _AddMcpClientDialogState extends State<_AddMcpClientDialog> {
             ),
             const SizedBox(height: 6),
             Wrap(
-              spacing: FaiSpace.xs,
-              runSpacing: FaiSpace.xs,
+              spacing: ChainSpace.xs,
+              runSpacing: ChainSpace.xs,
               children: [
                 for (final s in _kMcpSuggestions)
                   ActionChip(
@@ -1260,7 +1260,7 @@ class _AddMcpClientDialogState extends State<_AddMcpClientDialog> {
                   ),
               ],
             ),
-            const Divider(height: FaiSpace.xl),
+            const Divider(height: ChainSpace.xl),
             TextField(
               controller: _name,
               autofocus: true,
@@ -1271,7 +1271,7 @@ class _AddMcpClientDialogState extends State<_AddMcpClientDialog> {
                 isDense: true,
               ),
             ),
-            const SizedBox(height: FaiSpace.sm),
+            const SizedBox(height: ChainSpace.sm),
             TextField(
               controller: _endpoint,
               decoration: InputDecoration(
@@ -1281,7 +1281,7 @@ class _AddMcpClientDialogState extends State<_AddMcpClientDialog> {
                 isDense: true,
               ),
             ),
-            const SizedBox(height: FaiSpace.sm),
+            const SizedBox(height: ChainSpace.sm),
             TextField(
               controller: _apiKey,
               decoration: InputDecoration(
@@ -1292,7 +1292,7 @@ class _AddMcpClientDialogState extends State<_AddMcpClientDialog> {
                 isDense: true,
               ),
             ),
-            const SizedBox(height: FaiSpace.sm),
+            const SizedBox(height: ChainSpace.sm),
             TextField(
               controller: _desc,
               decoration: InputDecoration(
@@ -1377,10 +1377,10 @@ class _N8nEndpointsPanel extends StatelessWidget {
                 fontSize: 10,
               ),
             ),
-            const SizedBox(width: FaiSpace.sm),
-            FaiPill(
+            const SizedBox(width: ChainSpace.sm),
+            ChainPill(
               label: l.n8nEndpointsCount(endpoints.length),
-              tone: FaiPillTone.neutral,
+              tone: ChainPillTone.neutral,
             ),
             const Spacer(),
             IconButton(
@@ -1407,10 +1407,10 @@ class _N8nEndpointsPanel extends StatelessWidget {
             color: theme.colorScheme.onSurfaceVariant,
           ),
         ),
-        const SizedBox(height: FaiSpace.sm),
+        const SizedBox(height: ChainSpace.sm),
         if (endpoints.isEmpty)
           Padding(
-            padding: const EdgeInsets.symmetric(vertical: FaiSpace.sm),
+            padding: const EdgeInsets.symmetric(vertical: ChainSpace.sm),
             child: Text(
               l.n8nEmpty,
               style: theme.textTheme.bodySmall?.copyWith(
@@ -1437,7 +1437,7 @@ class _N8nEndpointRow extends StatelessWidget {
     final l = AppLocalizations.of(context)!;
     final ok = endpoint.healthy;
     final dotColor = endpoint.errorKind.isEmpty
-        ? (ok ? FaiColors.success : FaiColors.muted)
+        ? (ok ? ChainColors.success : ChainColors.muted)
         : theme.colorScheme.error;
     return Padding(
       padding: const EdgeInsets.symmetric(vertical: 4),
@@ -1448,7 +1448,7 @@ class _N8nEndpointRow extends StatelessWidget {
             padding: const EdgeInsets.only(top: 6),
             child: Icon(Icons.circle, size: 8, color: dotColor),
           ),
-          const SizedBox(width: FaiSpace.sm),
+          const SizedBox(width: ChainSpace.sm),
           Expanded(
             child: Column(
               crossAxisAlignment: CrossAxisAlignment.start,
@@ -1457,28 +1457,28 @@ class _N8nEndpointRow extends StatelessWidget {
                   children: [
                     Text(
                       endpoint.name,
-                      style: FaiTheme.mono(
+                      style: ChainTheme.mono(
                         size: 12,
                         weight: FontWeight.w600,
                         color: theme.colorScheme.onSurface,
                       ),
                     ),
-                    const SizedBox(width: FaiSpace.sm),
+                    const SizedBox(width: ChainSpace.sm),
                     if (endpoint.workflowCount > 0)
-                      FaiPill(
+                      ChainPill(
                         label: l.n8nWorkflowsCount(endpoint.workflowCount),
-                        tone: FaiPillTone.success,
+                        tone: ChainPillTone.success,
                       )
                     else if (endpoint.errorKind.isNotEmpty)
-                      FaiPill(
+                      ChainPill(
                         label: endpoint.errorKind,
-                        tone: FaiPillTone.danger,
+                        tone: ChainPillTone.danger,
                       ),
                   ],
                 ),
                 Text(
                   endpoint.baseUrl,
-                  style: FaiTheme.mono(
+                  style: ChainTheme.mono(
                     size: 10,
                     color: theme.colorScheme.onSurfaceVariant,
                   ),
@@ -1554,7 +1554,7 @@ class _AddN8nEndpointDialogState extends State<_AddN8nEndpointDialog> {
                 color: theme.colorScheme.onSurfaceVariant,
               ),
             ),
-            const SizedBox(height: FaiSpace.md),
+            const SizedBox(height: ChainSpace.md),
             TextField(
               controller: _name,
               autofocus: true,
@@ -1565,7 +1565,7 @@ class _AddN8nEndpointDialogState extends State<_AddN8nEndpointDialog> {
                 isDense: true,
               ),
             ),
-            const SizedBox(height: FaiSpace.sm),
+            const SizedBox(height: ChainSpace.sm),
             TextField(
               controller: _baseUrl,
               decoration: InputDecoration(
@@ -1575,7 +1575,7 @@ class _AddN8nEndpointDialogState extends State<_AddN8nEndpointDialog> {
                 isDense: true,
               ),
             ),
-            const SizedBox(height: FaiSpace.sm),
+            const SizedBox(height: ChainSpace.sm),
             TextField(
               controller: _apiKey,
               decoration: InputDecoration(
@@ -1586,7 +1586,7 @@ class _AddN8nEndpointDialogState extends State<_AddN8nEndpointDialog> {
                 isDense: true,
               ),
             ),
-            const SizedBox(height: FaiSpace.sm),
+            const SizedBox(height: ChainSpace.sm),
             TextField(
               controller: _desc,
               decoration: InputDecoration(
@@ -1718,7 +1718,7 @@ class _MaintenancePanelState extends State<_MaintenancePanel> {
       _resetting = true;
       _resultText = null;
     });
-    final r = await SystemActions.faiReset(
+    final r = await SystemActions.chainReset(
       keepModules: _keepModules,
       keepData: _keepData,
     );
@@ -1755,7 +1755,7 @@ class _MaintenancePanelState extends State<_MaintenancePanel> {
             color: theme.colorScheme.onSurfaceVariant,
           ),
         ),
-        const SizedBox(height: FaiSpace.sm),
+        const SizedBox(height: ChainSpace.sm),
         CheckboxListTile(
           contentPadding: EdgeInsets.zero,
           dense: true,
@@ -1788,7 +1788,7 @@ class _MaintenancePanelState extends State<_MaintenancePanel> {
             ),
           ),
         ),
-        const SizedBox(height: FaiSpace.sm),
+        const SizedBox(height: ChainSpace.sm),
         Row(
           children: [
             FilledButton.icon(
@@ -1813,8 +1813,8 @@ class _MaintenancePanelState extends State<_MaintenancePanel> {
           ],
         ),
         if (_resultText != null) ...[
-          const SizedBox(height: FaiSpace.sm),
-          FaiErrorBox(text: _resultText!, isError: !_resultOk, maxHeight: 240),
+          const SizedBox(height: ChainSpace.sm),
+          ChainErrorBox(text: _resultText!, isError: !_resultOk, maxHeight: 240),
         ],
       ],
     );
@@ -1891,7 +1891,7 @@ class _RegistryCredentialsPanelState extends State<_RegistryCredentialsPanel> {
             color: theme.colorScheme.onSurfaceVariant,
           ),
         ),
-        const SizedBox(height: FaiSpace.sm),
+        const SizedBox(height: ChainSpace.sm),
         Row(
           children: [
             Icon(
@@ -1901,7 +1901,7 @@ class _RegistryCredentialsPanelState extends State<_RegistryCredentialsPanel> {
                   ? theme.colorScheme.primary
                   : theme.colorScheme.onSurfaceVariant,
             ),
-            const SizedBox(width: FaiSpace.xs),
+            const SizedBox(width: ChainSpace.xs),
             Text(
               isConfigured
                   ? l.registryTokenStatusConfigured(widget.configuredChars!)
@@ -1925,7 +1925,7 @@ class _RegistryCredentialsPanelState extends State<_RegistryCredentialsPanel> {
               ),
           ],
         ),
-        const SizedBox(height: FaiSpace.sm),
+        const SizedBox(height: ChainSpace.sm),
         Row(
           children: [
             Expanded(
@@ -1947,7 +1947,7 @@ class _RegistryCredentialsPanelState extends State<_RegistryCredentialsPanel> {
                 ),
               ),
             ),
-            const SizedBox(width: FaiSpace.sm),
+            const SizedBox(width: ChainSpace.sm),
             FilledButton.icon(
               icon: const Icon(Icons.save_outlined, size: 14),
               label: Text(l.registryTokenSaveButton),
@@ -2040,7 +2040,7 @@ class _HubAuthTokenPanelState extends State<_HubAuthTokenPanel> {
             color: theme.colorScheme.onSurfaceVariant,
           ),
         ),
-        const SizedBox(height: FaiSpace.sm),
+        const SizedBox(height: ChainSpace.sm),
         Row(
           children: [
             Icon(
@@ -2050,7 +2050,7 @@ class _HubAuthTokenPanelState extends State<_HubAuthTokenPanel> {
                   ? theme.colorScheme.primary
                   : theme.colorScheme.onSurfaceVariant,
             ),
-            const SizedBox(width: FaiSpace.xs),
+            const SizedBox(width: ChainSpace.xs),
             Text(
               isConfigured
                   ? l.hubAuthTokenStatusConfigured(widget.configuredChars!)
@@ -2074,7 +2074,7 @@ class _HubAuthTokenPanelState extends State<_HubAuthTokenPanel> {
               ),
           ],
         ),
-        const SizedBox(height: FaiSpace.sm),
+        const SizedBox(height: ChainSpace.sm),
         Row(
           children: [
             Expanded(
@@ -2096,7 +2096,7 @@ class _HubAuthTokenPanelState extends State<_HubAuthTokenPanel> {
                 ),
               ),
             ),
-            const SizedBox(width: FaiSpace.sm),
+            const SizedBox(width: ChainSpace.sm),
             FilledButton.icon(
               icon: const Icon(Icons.save_outlined, size: 14),
               label: Text(l.hubAuthTokenSaveButton),
@@ -2410,10 +2410,10 @@ class _DefaultScopePanelState extends State<_DefaultScopePanel> {
             color: theme.colorScheme.onSurfaceVariant,
           ),
         ),
-        const SizedBox(height: FaiSpace.sm),
+        const SizedBox(height: ChainSpace.sm),
         if (_loading)
           const Padding(
-            padding: EdgeInsets.symmetric(vertical: FaiSpace.sm),
+            padding: EdgeInsets.symmetric(vertical: ChainSpace.sm),
             child: SizedBox(
               height: 16,
               width: 16,
@@ -2438,7 +2438,7 @@ class _DefaultScopePanelState extends State<_DefaultScopePanel> {
               onDown: () => _moveDown(i),
               onRemove: () => _removeAt(i),
             ),
-          const SizedBox(height: FaiSpace.sm),
+          const SizedBox(height: ChainSpace.sm),
           Row(
             children: [
               Expanded(
@@ -2453,7 +2453,7 @@ class _DefaultScopePanelState extends State<_DefaultScopePanel> {
                   onSubmitted: _saving ? null : _addEntry,
                 ),
               ),
-              const SizedBox(width: FaiSpace.sm),
+              const SizedBox(width: ChainSpace.sm),
               FilledButton.icon(
                 icon: const Icon(Icons.add, size: 14),
                 label: Text(l.defaultScopeAddButton),
@@ -2464,7 +2464,7 @@ class _DefaultScopePanelState extends State<_DefaultScopePanel> {
             ],
           ),
           if (unusedSuggestions.isNotEmpty) ...[
-            const SizedBox(height: FaiSpace.sm),
+            const SizedBox(height: ChainSpace.sm),
             Text(
               l.defaultScopeSuggestions,
               style: theme.textTheme.bodySmall?.copyWith(
@@ -2474,7 +2474,7 @@ class _DefaultScopePanelState extends State<_DefaultScopePanel> {
             ),
             const SizedBox(height: 4),
             Wrap(
-              spacing: FaiSpace.xs,
+              spacing: ChainSpace.xs,
               runSpacing: 4,
               children: [
                 for (final s in unusedSuggestions)
@@ -2489,7 +2489,7 @@ class _DefaultScopePanelState extends State<_DefaultScopePanel> {
             ),
           ],
           if (_error != null) ...[
-            const SizedBox(height: FaiSpace.sm),
+            const SizedBox(height: ChainSpace.sm),
             Text(
               _error!,
               style: theme.textTheme.bodySmall?.copyWith(
@@ -2603,7 +2603,7 @@ class _Sidebar extends StatelessWidget {
       child: Container(
         color: theme.colorScheme.surfaceContainer,
         child: ListView(
-          padding: const EdgeInsets.symmetric(vertical: FaiSpace.lg),
+          padding: const EdgeInsets.symmetric(vertical: ChainSpace.lg),
           children: [
             for (final (cat, icon, label) in items)
               _SidebarRow(
@@ -2639,24 +2639,24 @@ class _SidebarRow extends StatelessWidget {
         ? theme.colorScheme.onSurface
         : theme.colorScheme.onSurfaceVariant;
     return Padding(
-      padding: const EdgeInsets.symmetric(horizontal: FaiSpace.sm, vertical: 2),
+      padding: const EdgeInsets.symmetric(horizontal: ChainSpace.sm, vertical: 2),
       child: Material(
         color: selected
             ? theme.colorScheme.primary.withValues(alpha: 0.14)
             : Colors.transparent,
-        borderRadius: BorderRadius.circular(FaiRadius.sm),
+        borderRadius: BorderRadius.circular(ChainRadius.sm),
         child: InkWell(
           onTap: onTap,
-          borderRadius: BorderRadius.circular(FaiRadius.sm),
+          borderRadius: BorderRadius.circular(ChainRadius.sm),
           child: Padding(
             padding: const EdgeInsets.symmetric(
-              horizontal: FaiSpace.md,
+              horizontal: ChainSpace.md,
               vertical: 8,
             ),
             child: Row(
               children: [
                 Icon(icon, size: 16, color: fg),
-                const SizedBox(width: FaiSpace.sm),
+                const SizedBox(width: ChainSpace.sm),
                 Text(
                   label,
                   style: theme.textTheme.bodyMedium?.copyWith(
diff --git a/lib/widgets/fai_status_dot.dart b/lib/widgets/chain_status_dot.dart
similarity index 76%
rename from lib/widgets/fai_status_dot.dart
rename to lib/widgets/chain_status_dot.dart
index 136aac6..e34ca7d 100644
--- a/lib/widgets/fai_status_dot.dart
+++ b/lib/widgets/chain_status_dot.dart
@@ -1,11 +1,11 @@
-// FaiStatusDot — small pulsing dot used as a "live" indicator.
+// ChainStatusDot — small pulsing dot used as a "live" indicator.
 // Goes still when [pulsing] is false, breathes gently when true.
 
 import 'package:flutter/material.dart';
 
 import '../theme/tokens.dart';
 
-class FaiStatusDot extends StatefulWidget {
+class ChainStatusDot extends StatefulWidget {
   final Color color;
 
   /// When true, the dot fades between full and 30% opacity.
@@ -14,7 +14,7 @@ class FaiStatusDot extends StatefulWidget {
 
   final double size;
 
-  const FaiStatusDot({
+  const ChainStatusDot({
     super.key,
     required this.color,
     this.pulsing = false,
@@ -22,10 +22,10 @@ class FaiStatusDot extends StatefulWidget {
   });
 
   @override
-  State<FaiStatusDot> createState() => _FaiStatusDotState();
+  State<ChainStatusDot> createState() => _FaiStatusDotState();
 }
 
-class _FaiStatusDotState extends State<FaiStatusDot>
+class _FaiStatusDotState extends State<ChainStatusDot>
     with SingleTickerProviderStateMixin {
   late final AnimationController _ctrl;
 
@@ -40,7 +40,7 @@ class _FaiStatusDotState extends State<FaiStatusDot>
   }
 
   @override
-  void didUpdateWidget(covariant FaiStatusDot old) {
+  void didUpdateWidget(covariant ChainStatusDot old) {
     super.didUpdateWidget(old);
     if (widget.pulsing && !_ctrl.isAnimating) {
       _ctrl.repeat(reverse: true);
@@ -86,10 +86,10 @@ class _FaiStatusDotState extends State<FaiStatusDot>
 }
 
 /// Convenience presets.
-class FaiStatusDots {
-  FaiStatusDots._();
+class ChainStatusDots {
+  ChainStatusDots._();
   static Widget live() =>
-      const FaiStatusDot(color: FaiColors.success, pulsing: true);
-  static Widget idle() => const FaiStatusDot(color: FaiColors.muted);
-  static Widget down() => const FaiStatusDot(color: FaiColors.danger);
+      const ChainStatusDot(color: ChainColors.success, pulsing: true);
+  static Widget idle() => const ChainStatusDot(color: ChainColors.muted);
+  static Widget down() => const ChainStatusDot(color: ChainColors.danger);
 }
diff --git a/lib/widgets/fai_system_ai_editor.dart b/lib/widgets/chain_system_ai_editor.dart
similarity index 92%
rename from lib/widgets/fai_system_ai_editor.dart
rename to lib/widgets/chain_system_ai_editor.dart
index e8f9dde..90d70d5 100644
--- a/lib/widgets/fai_system_ai_editor.dart
+++ b/lib/widgets/chain_system_ai_editor.dart
@@ -1,4 +1,4 @@
-// FaiSystemAiEditor — modal for configuring the hub-internal
+// ChainSystemAiEditor — modal for configuring the hub-internal
 // System AI from inside Studio. Mirrors the YAML block but with
 // provider presets, in-place explainers, and a "Test connection"
 // button. On save, calls HubAdmin.UpdateSystemAi which both
@@ -11,10 +11,10 @@ import '../data/hub.dart';
 import '../l10n/app_localizations.dart';
 import '../theme/theme.dart';
 import '../theme/tokens.dart';
-import 'fai_pill.dart';
+import 'chain_pill.dart';
 
 /// Provider preset metadata kept in sync with
-/// `fai_hub::operator_config::SystemLlmProvider`. Anything that
+/// `chain_hub::operator_config::SystemLlmProvider`. Anything that
 /// is operator-visible (label, description, default endpoint,
 /// suggested env-var) lives here so the dropdown self-explains
 /// without needing to read the source.
@@ -108,10 +108,10 @@ class _ProviderPreset {
   }
 }
 
-class FaiSystemAiEditor extends StatefulWidget {
+class ChainSystemAiEditor extends StatefulWidget {
   final SystemAiStatus initial;
 
-  const FaiSystemAiEditor({super.key, required this.initial});
+  const ChainSystemAiEditor({super.key, required this.initial});
 
   /// Convenience launcher. Returns the new status when the
   /// operator saved, null on cancel.
@@ -121,15 +121,15 @@ class FaiSystemAiEditor extends StatefulWidget {
   ) {
     return showDialog<SystemAiStatus>(
       context: context,
-      builder: (_) => FaiSystemAiEditor(initial: initial),
+      builder: (_) => ChainSystemAiEditor(initial: initial),
     );
   }
 
   @override
-  State<FaiSystemAiEditor> createState() => _FaiSystemAiEditorState();
+  State<ChainSystemAiEditor> createState() => _FaiSystemAiEditorState();
 }
 
-class _FaiSystemAiEditorState extends State<FaiSystemAiEditor> {
+class _FaiSystemAiEditorState extends State<ChainSystemAiEditor> {
   late _ProviderPreset _preset;
   late final TextEditingController _endpoint;
   late final TextEditingController _model;
@@ -365,11 +365,11 @@ class _FaiSystemAiEditorState extends State<FaiSystemAiEditor> {
     return AlertDialog(
       title: Text(l.systemAiTitle),
       shape: RoundedRectangleBorder(
-        borderRadius: BorderRadius.circular(FaiRadius.md),
+        borderRadius: BorderRadius.circular(ChainRadius.md),
       ),
       contentPadding: const EdgeInsets.symmetric(
-        horizontal: FaiSpace.xl,
-        vertical: FaiSpace.lg,
+        horizontal: ChainSpace.xl,
+        vertical: ChainSpace.lg,
       ),
       content: ConstrainedBox(
         constraints: const BoxConstraints(maxWidth: 520, maxHeight: 600),
@@ -385,10 +385,10 @@ class _FaiSystemAiEditorState extends State<FaiSystemAiEditor> {
                 ),
               ),
               if (_hw != null) ...[
-                const SizedBox(height: FaiSpace.sm),
+                const SizedBox(height: ChainSpace.sm),
                 _HardwareBanner(hw: _hw!, lastReviewed: _curated?.lastReviewed),
               ],
-              const SizedBox(height: FaiSpace.lg),
+              const SizedBox(height: ChainSpace.lg),
               _ProviderDropdown(value: _preset, onChanged: _onProviderChanged),
               const SizedBox(height: 4),
               Text(
@@ -397,17 +397,17 @@ class _FaiSystemAiEditorState extends State<FaiSystemAiEditor> {
                   color: theme.colorScheme.onSurfaceVariant,
                 ),
               ),
-              const SizedBox(height: FaiSpace.md),
+              const SizedBox(height: ChainSpace.md),
               TextField(
                 controller: _endpoint,
-                style: FaiTheme.mono(size: 12),
+                style: ChainTheme.mono(size: 12),
                 decoration: InputDecoration(
                   labelText: l.systemAiEndpointLabel,
                   border: const OutlineInputBorder(),
                   isDense: true,
                 ),
               ),
-              const SizedBox(height: FaiSpace.md),
+              const SizedBox(height: ChainSpace.md),
               _ModelPicker(
                 controller: _model,
                 preset: _preset,
@@ -424,10 +424,10 @@ class _FaiSystemAiEditorState extends State<FaiSystemAiEditor> {
                     ? null
                     : _pullModel,
               ),
-              const SizedBox(height: FaiSpace.md),
+              const SizedBox(height: ChainSpace.md),
               TextField(
                 controller: _apiKeyEnv,
-                style: FaiTheme.mono(size: 12),
+                style: ChainTheme.mono(size: 12),
                 decoration: InputDecoration(
                   labelText: _preset.wire == 'openai'
                       ? l.systemAiApiKeyRequired
@@ -445,20 +445,20 @@ class _FaiSystemAiEditorState extends State<FaiSystemAiEditor> {
                   color: theme.colorScheme.onSurfaceVariant,
                 ),
               ),
-              const SizedBox(height: FaiSpace.lg),
+              const SizedBox(height: ChainSpace.lg),
               _PrivacyModeChips(
                 value: _privacyMode,
                 onChanged: (v) => setState(() => _privacyMode = v),
               ),
               if (widget.initial.cacheCount > 0) ...[
-                const SizedBox(height: FaiSpace.md),
+                const SizedBox(height: ChainSpace.md),
                 _CacheStatusRow(
                   cacheCount: widget.initial.cacheCount,
                   onClear: _saving || _testing ? null : _clearCache,
                 ),
               ],
               if (_error != null) ...[
-                const SizedBox(height: FaiSpace.md),
+                const SizedBox(height: ChainSpace.md),
                 Text(
                   _error!,
                   style: theme.textTheme.bodySmall?.copyWith(
@@ -467,7 +467,7 @@ class _FaiSystemAiEditorState extends State<FaiSystemAiEditor> {
                 ),
               ],
               if (_testResult != null) ...[
-                const SizedBox(height: FaiSpace.md),
+                const SizedBox(height: ChainSpace.md),
                 _TestResultPanel(result: _testResult!),
               ],
             ],
@@ -573,11 +573,11 @@ class _PrivacyModeChips extends StatelessWidget {
           for (final (wire, label, desc) in modes)
             InkWell(
               onTap: () => onChanged(wire),
-              borderRadius: BorderRadius.circular(FaiRadius.sm),
+              borderRadius: BorderRadius.circular(ChainRadius.sm),
               child: Padding(
                 padding: const EdgeInsets.symmetric(
-                  vertical: FaiSpace.sm,
-                  horizontal: FaiSpace.sm,
+                  vertical: ChainSpace.sm,
+                  horizontal: ChainSpace.sm,
                 ),
                 child: Row(
                   children: [
@@ -616,13 +616,13 @@ class _TestResultPanel extends StatelessWidget {
     final theme = Theme.of(context);
     final l = AppLocalizations.of(context)!;
     final ok = result.isSuccess;
-    final color = ok ? FaiColors.success : theme.colorScheme.error;
+    final color = ok ? ChainColors.success : theme.colorScheme.error;
     return Container(
       width: double.infinity,
-      padding: const EdgeInsets.all(FaiSpace.md),
+      padding: const EdgeInsets.all(ChainSpace.md),
       decoration: BoxDecoration(
         color: theme.colorScheme.surfaceContainerHigh,
-        borderRadius: BorderRadius.circular(FaiRadius.sm),
+        borderRadius: BorderRadius.circular(ChainRadius.sm),
         border: Border.all(color: color.withValues(alpha: 0.3)),
       ),
       child: Column(
@@ -635,16 +635,16 @@ class _TestResultPanel extends StatelessWidget {
                 size: 14,
                 color: color,
               ),
-              const SizedBox(width: FaiSpace.xs),
+              const SizedBox(width: ChainSpace.xs),
               Text(
                 ok ? l.systemAiConnectionOk : l.systemAiConnectionFailed,
                 style: theme.textTheme.bodyMedium?.copyWith(color: color),
               ),
               const Spacer(),
               if (ok && result.latencyMs > 0)
-                FaiPill(
+                ChainPill(
                   label: '${result.latencyMs} ms',
-                  tone: FaiPillTone.neutral,
+                  tone: ChainPillTone.neutral,
                   monospace: true,
                 ),
             ],
@@ -652,10 +652,10 @@ class _TestResultPanel extends StatelessWidget {
           const SizedBox(height: 4),
           SelectableText(
             ok ? l.systemAiReplyPrefix(result.text) : result.text,
-            style: FaiTheme.mono(size: 11, color: theme.colorScheme.onSurface),
+            style: ChainTheme.mono(size: 11, color: theme.colorScheme.onSurface),
           ),
           if (!ok && result.fixHint(l).isNotEmpty) ...[
-            const SizedBox(height: FaiSpace.xs),
+            const SizedBox(height: ChainSpace.xs),
             Text(
               result.fixHint(l),
               style: theme.textTheme.bodySmall?.copyWith(
@@ -720,7 +720,7 @@ class _ModelPicker extends StatelessWidget {
                 valueListenable: controller,
                 builder: (_, _, _) => TextField(
                   controller: controller,
-                  style: FaiTheme.mono(size: 12),
+                  style: ChainTheme.mono(size: 12),
                   decoration: InputDecoration(
                     labelText: l.systemAiModelLabel,
                     hintText: preset.modelHint.isEmpty
@@ -738,7 +738,7 @@ class _ModelPicker extends StatelessWidget {
                 ),
               ),
             ),
-            const SizedBox(width: FaiSpace.sm),
+            const SizedBox(width: ChainSpace.sm),
             OutlinedButton.icon(
               onPressed: onRefresh,
               icon: loading
@@ -751,7 +751,7 @@ class _ModelPicker extends StatelessWidget {
               label: Text(l.systemAiRefresh),
             ),
             if (_isOllama) ...[
-              const SizedBox(width: FaiSpace.sm),
+              const SizedBox(width: ChainSpace.sm),
               OutlinedButton.icon(
                 onPressed: onPull,
                 icon: pulling
@@ -776,7 +776,7 @@ class _ModelPicker extends StatelessWidget {
           ),
         ],
         if (models != null) ...[
-          const SizedBox(height: FaiSpace.sm),
+          const SizedBox(height: ChainSpace.sm),
           if (models!.isEmpty)
             Text(
               _isOllama ? l.systemAiNoModelsOllama : l.systemAiNoModelsGeneric,
@@ -786,8 +786,8 @@ class _ModelPicker extends StatelessWidget {
             )
           else ...[
             Wrap(
-              spacing: FaiSpace.xs,
-              runSpacing: FaiSpace.xs,
+              spacing: ChainSpace.xs,
+              runSpacing: ChainSpace.xs,
               children: [
                 for (final id in _sortedBySuitability(
                   models!,
@@ -850,13 +850,13 @@ extension _SuitabilityCopy on _Suitability {
   Color color(ColorScheme cs) {
     switch (this) {
       case _Suitability.recommended:
-        return FaiColors.success;
+        return ChainColors.success;
       case _Suitability.balanced:
         return cs.primary;
       case _Suitability.small:
-        return FaiColors.warning;
+        return ChainColors.warning;
       case _Suitability.large:
-        return FaiColors.warning;
+        return ChainColors.warning;
       case _Suitability.huge:
         return cs.error;
       case _Suitability.unknown:
@@ -1005,7 +1005,7 @@ class _ModelChip extends StatelessWidget {
           size: suitability == _Suitability.recommended ? 14 : 9,
           color: color,
         ),
-        label: Text(id, style: FaiTheme.mono(size: 11)),
+        label: Text(id, style: ChainTheme.mono(size: 11)),
         side: BorderSide(color: color.withValues(alpha: 0.4)),
         onPressed: onTap,
       ),
@@ -1030,10 +1030,10 @@ class _HardwareBanner extends StatelessWidget {
         ? l.systemAiHwReviewed(lastReviewed!)
         : '';
     return Container(
-      padding: const EdgeInsets.symmetric(horizontal: FaiSpace.sm, vertical: 6),
+      padding: const EdgeInsets.symmetric(horizontal: ChainSpace.sm, vertical: 6),
       decoration: BoxDecoration(
         color: theme.colorScheme.surfaceContainerHigh,
-        borderRadius: BorderRadius.circular(FaiRadius.sm),
+        borderRadius: BorderRadius.circular(ChainRadius.sm),
         border: Border.all(color: theme.colorScheme.outlineVariant),
       ),
       child: Row(
@@ -1067,7 +1067,7 @@ class _SuitabilityLegend extends StatelessWidget {
     final theme = Theme.of(context);
     final l = AppLocalizations.of(context)!;
     Widget dot(Color c, String label) => Padding(
-      padding: const EdgeInsets.only(right: FaiSpace.md),
+      padding: const EdgeInsets.only(right: ChainSpace.md),
       child: Row(
         mainAxisSize: MainAxisSize.min,
         children: [
@@ -1090,11 +1090,11 @@ class _SuitabilityLegend extends StatelessWidget {
       crossAxisAlignment: WrapCrossAlignment.center,
       children: [
         Padding(
-          padding: const EdgeInsets.only(right: FaiSpace.md),
+          padding: const EdgeInsets.only(right: ChainSpace.md),
           child: Row(
             mainAxisSize: MainAxisSize.min,
             children: [
-              Icon(Icons.star, size: 11, color: FaiColors.success),
+              Icon(Icons.star, size: 11, color: ChainColors.success),
               const SizedBox(width: 4),
               Text(
                 l.systemAiLegendRecommended(tierTag),
@@ -1107,7 +1107,7 @@ class _SuitabilityLegend extends StatelessWidget {
           ),
         ),
         dot(theme.colorScheme.primary, l.systemAiLegendBalanced),
-        dot(FaiColors.warning, l.systemAiLegendSmallLarge),
+        dot(ChainColors.warning, l.systemAiLegendSmallLarge),
         dot(theme.colorScheme.error, l.systemAiLegendHuge),
         dot(theme.colorScheme.outline, l.systemAiLegendUnknown),
       ],
@@ -1131,10 +1131,10 @@ class _CacheStatusRow extends StatelessWidget {
     final theme = Theme.of(context);
     final l = AppLocalizations.of(context)!;
     return Container(
-      padding: const EdgeInsets.symmetric(horizontal: FaiSpace.sm, vertical: 6),
+      padding: const EdgeInsets.symmetric(horizontal: ChainSpace.sm, vertical: 6),
       decoration: BoxDecoration(
         color: theme.colorScheme.surfaceContainerHigh,
-        borderRadius: BorderRadius.circular(FaiRadius.sm),
+        borderRadius: BorderRadius.circular(ChainRadius.sm),
         border: Border.all(color: theme.colorScheme.outlineVariant),
       ),
       child: Row(
diff --git a/lib/widgets/theme_picker_grid.dart b/lib/widgets/theme_picker_grid.dart
index e7c781d..4f54bf4 100644
--- a/lib/widgets/theme_picker_grid.dart
+++ b/lib/widgets/theme_picker_grid.dart
@@ -55,7 +55,7 @@ class _ThemePickerGridState extends State<ThemePickerGrid> {
       builder: (context, snap) {
         if (snap.connectionState != ConnectionState.done) {
           return const Padding(
-            padding: EdgeInsets.symmetric(vertical: FaiSpace.sm),
+            padding: EdgeInsets.symmetric(vertical: ChainSpace.sm),
             child: SizedBox(
               width: 14,
               height: 14,
@@ -85,7 +85,7 @@ class _ThemePickerGridState extends State<ThemePickerGrid> {
                 _customTile(theme, l, active),
               ],
             ),
-            const SizedBox(height: FaiSpace.sm),
+            const SizedBox(height: ChainSpace.sm),
             Text(
               l.themePluginHint,
               style: theme.textTheme.bodySmall?.copyWith(
@@ -248,13 +248,13 @@ class _Tile extends StatelessWidget {
       height: 76,
       child: Material(
         color: theme.colorScheme.surfaceContainerHigh,
-        borderRadius: BorderRadius.circular(FaiRadius.sm),
+        borderRadius: BorderRadius.circular(ChainRadius.sm),
         child: InkWell(
           onTap: onTap,
-          borderRadius: BorderRadius.circular(FaiRadius.sm),
+          borderRadius: BorderRadius.circular(ChainRadius.sm),
           child: Container(
             decoration: BoxDecoration(
-              borderRadius: BorderRadius.circular(FaiRadius.sm),
+              borderRadius: BorderRadius.circular(ChainRadius.sm),
               border: Border.all(
                 color: selected
                     ? theme.colorScheme.primary
@@ -432,7 +432,7 @@ class _ColorPickerDialogState extends State<_ColorPickerDialog> {
                   ),
               ],
             ),
-            const SizedBox(height: FaiSpace.md),
+            const SizedBox(height: ChainSpace.md),
             TextField(
               controller: _hex,
               decoration: InputDecoration(
@@ -444,7 +444,7 @@ class _ColorPickerDialogState extends State<_ColorPickerDialog> {
               onChanged: _commitHex,
               onSubmitted: _commitHex,
             ),
-            const SizedBox(height: FaiSpace.md),
+            const SizedBox(height: ChainSpace.md),
             Text(l.themePluginCustomPreview, style: theme.textTheme.labelSmall),
             const SizedBox(height: 6),
             Row(
diff --git a/lib/widgets/widgets.dart b/lib/widgets/widgets.dart
index adea76b..5597bd2 100644
--- a/lib/widgets/widgets.dart
+++ b/lib/widgets/widgets.dart
@@ -4,17 +4,17 @@
 // primitives directly — no Material `Card` / generic `Container`
 // soup in page code.
 
-export 'fai_binary_recovery.dart';
-export 'fai_card.dart';
-export 'fai_data_row.dart';
-export 'fai_delta_mark.dart';
-export 'fai_empty_state.dart';
-export 'fai_en_badge.dart';
-export 'fai_error_box.dart';
-export 'fai_flow_output.dart';
-export 'fai_log_viewer.dart';
-export 'fai_module_sheet.dart';
-export 'fai_pill.dart';
-export 'fai_settings_dialog.dart';
-export 'fai_status_dot.dart';
-export 'fai_system_ai_editor.dart';
+export 'chain_binary_recovery.dart';
+export 'chain_card.dart';
+export 'chain_data_row.dart';
+export 'chain_delta_mark.dart';
+export 'chain_empty_state.dart';
+export 'chain_en_badge.dart';
+export 'chain_error_box.dart';
+export 'chain_flow_output.dart';
+export 'chain_log_viewer.dart';
+export 'chain_module_sheet.dart';
+export 'chain_pill.dart';
+export 'chain_settings_dialog.dart';
+export 'chain_status_dot.dart';
+export 'chain_system_ai_editor.dart';
diff --git a/test/fai_log_test.dart b/test/chain_log_test.dart
similarity index 71%
rename from test/fai_log_test.dart
rename to test/chain_log_test.dart
index 0dae9d0..4104b0a 100644
--- a/test/fai_log_test.dart
+++ b/test/chain_log_test.dart
@@ -1,36 +1,36 @@
-// Unit tests for FaiLog — the central error log that
+// Unit tests for ChainLog — the central error log that
 // `~/.fai/logs/studio-errors.log` is the operator-visible
 // surface of. The tests redirect the singleton at a temp file
-// via `FaiLog.testPathOverride` so the real log under HOME is
+// via `ChainLog.testPathOverride` so the real log under HOME is
 // never touched.
 
 import 'dart:convert';
 import 'dart:io';
 
-import 'package:chain_studio/data/fai_log.dart';
+import 'package:chain_studio/data/chain_log.dart';
 import 'package:flutter_test/flutter_test.dart';
 
 void main() {
-  group('FaiLog', () {
+  group('ChainLog', () {
     late Directory tmp;
     late File logFile;
 
     setUp(() {
-      tmp = Directory.systemTemp.createTempSync('fai_log_test_');
+      tmp = Directory.systemTemp.createTempSync('chain_log_test_');
       logFile = File('${tmp.path}/studio-errors.log');
-      FaiLog.testPathOverride = logFile.path;
+      ChainLog.testPathOverride = logFile.path;
     });
 
     tearDown(() {
-      FaiLog.testPathOverride = null;
+      ChainLog.testPathOverride = null;
       try {
         tmp.deleteSync(recursive: true);
       } catch (_) {/* best-effort */}
     });
 
     test('append writes one JSON-shaped line per event', () async {
-      await FaiLog.instance.error('flows.run', 'boom');
-      final lines = await FaiLog.instance.tail();
+      await ChainLog.instance.error('flows.run', 'boom');
+      final lines = await ChainLog.instance.tail();
       expect(lines, hasLength(1));
       final entry = jsonDecode(lines.single) as Map<String, Object?>;
       expect(entry['source'], 'flows.run');
@@ -40,22 +40,22 @@ void main() {
     });
 
     test('context field is preserved when supplied', () async {
-      await FaiLog.instance.error(
+      await ChainLog.instance.error(
         'theme.plugin.load',
         Exception('endpoint unreachable'),
         context: 'capability=studio.theme.space',
       );
-      final lines = await FaiLog.instance.tail();
+      final lines = await ChainLog.instance.tail();
       final entry = jsonDecode(lines.single) as Map<String, Object?>;
       expect(entry['context'], 'capability=studio.theme.space');
       expect(entry['error'], contains('endpoint unreachable'));
     });
 
     test('tail returns oldest first', () async {
-      await FaiLog.instance.error('a', '1');
-      await FaiLog.instance.error('b', '2');
-      await FaiLog.instance.error('c', '3');
-      final lines = await FaiLog.instance.tail();
+      await ChainLog.instance.error('a', '1');
+      await ChainLog.instance.error('b', '2');
+      await ChainLog.instance.error('c', '3');
+      final lines = await ChainLog.instance.tail();
       expect(lines, hasLength(3));
       final sources = lines.map((l) => jsonDecode(l)['source']).toList();
       expect(sources, ['a', 'b', 'c']);
@@ -63,9 +63,9 @@ void main() {
 
     test('tail caps output at maxLines and keeps the newest', () async {
       for (var i = 0; i < 20; i++) {
-        await FaiLog.instance.error('burst', 'event-$i');
+        await ChainLog.instance.error('burst', 'event-$i');
       }
-      final lines = await FaiLog.instance.tail(maxLines: 5);
+      final lines = await ChainLog.instance.tail(maxLines: 5);
       expect(lines, hasLength(5));
       final last = jsonDecode(lines.last) as Map<String, Object?>;
       expect(last['error'], 'event-19');
@@ -77,7 +77,7 @@ void main() {
       // `.log.1` and a short fresh `.log`.
       logFile.parent.createSync(recursive: true);
       logFile.writeAsBytesSync(List.filled(257 * 1024, 0x20));
-      await FaiLog.instance.error('rotation', 'after-cap');
+      await ChainLog.instance.error('rotation', 'after-cap');
       expect(File('${logFile.path}.1').existsSync(), isTrue);
       final newSize = logFile.lengthSync();
       expect(newSize, lessThan(2 * 1024));
@@ -86,16 +86,16 @@ void main() {
     });
 
     test('path getter returns the override when set', () {
-      expect(FaiLog.instance.path, logFile.path);
+      expect(ChainLog.instance.path, logFile.path);
     });
 
     test('writes failing silently does not throw', () async {
       // Redirect to a deliberately impossible path. The error()
       // call must complete cleanly; the operator UI must never
       // crash because the disk is full / read-only / missing.
-      FaiLog.testPathOverride = '/this/path/does/not/exist/ever/x.log';
+      ChainLog.testPathOverride = '/this/path/does/not/exist/ever/x.log';
       await expectLater(
-        FaiLog.instance.error('bad.path', 'boom'),
+        ChainLog.instance.error('bad.path', 'boom'),
         completes,
       );
     });
diff --git a/test/integration/README.md b/test/integration/README.md
index e2f71f4..b3213df 100644
--- a/test/integration/README.md
+++ b/test/integration/README.md
@@ -35,14 +35,14 @@ flutter test test/integration/
 ```
 
 Prereq: a `fai` binary on PATH or at
-`../fai_platform/target/release/fai`. The harness skips with a
+`../fai_chain/target/release/chain`. The harness skips with a
 clear message when neither exists, so this command does not
 fail on a fresh checkout — it just reports skipped tests.
 
 To get the binary:
 
 ```bash
-cd ../fai_platform
+cd ../fai_chain
 cargo build --release --bin fai
 ```
 
@@ -52,11 +52,11 @@ A cold `chain serve` spends its first ~30s building the
 curated-model database and initialising SQLite migrations.
 `HubFixture.start()` waits up to 60s by default; if your local
 hub takes longer the first time, run `chain serve` once by hand
-against any temp `FAI_DATA_DIR` to warm the per-user cargo /
+against any temp `CHAIN_DATA_DIR` to warm the per-user cargo /
 SBOM caches:
 
 ```bash
-FAI_DATA_DIR=/tmp/fai_warmup chain serve --bind 127.0.0.1:0
+CHAIN_DATA_DIR=/tmp/chain_warmup chain serve --bind 127.0.0.1:0
 # wait for "hub started", Ctrl-C
 ```
 
@@ -66,7 +66,7 @@ Subsequent integration-test runs are quick.
 
 `.forgejo/workflows/ci.yml` doesn't run these yet. Adding them
 needs an artifact-passing pattern: the platform build job
-publishes `target/release/fai` as a CI artifact; the studio
+publishes `target/release/chain` as a CI artifact; the studio
 test job consumes it. Pattern is straightforward once we want
 it; it's deferred because we don't yet have enough integration
 tests to justify the CI runtime.
diff --git a/test/integration/capabilities_test.dart b/test/integration/capabilities_test.dart
index 0063548..6161e6b 100644
--- a/test/integration/capabilities_test.dart
+++ b/test/integration/capabilities_test.dart
@@ -22,7 +22,7 @@
 //   flutter test test/integration/
 //
 // CI does not yet run these by default — they need a built `fai`
-// binary in PATH or in ../fai_platform/target/release/. Wire that
+// binary in PATH or in ../chain_platform/target/release/. Wire that
 // in via .forgejo/workflows/ci.yml once the platform CI publishes
 // a Linux binary as an artifact for downstream jobs to consume.
 
diff --git a/test/integration/hub_fixture.dart b/test/integration/hub_fixture.dart
index d0c5836..c376c0a 100644
--- a/test/integration/hub_fixture.dart
+++ b/test/integration/hub_fixture.dart
@@ -72,7 +72,7 @@ class HubFixture {
       if (skipIfBinaryMissing) {
         markTestSkipped(
           'Hub fixture skipped: no `fai` binary found on PATH or in '
-          '../fai_platform/target/release/fai. Build it with '
+          '../chain_platform/target/release/fai. Build it with '
           '`cargo build --release` and re-run.',
         );
         return null;
@@ -86,15 +86,15 @@ class HubFixture {
 
     // Run as a child process. `serve --bind` lets us avoid the
     // default 50051 (and any local daemon the developer happens
-    // to be running). FAI_DATA_DIR keeps the temp footprint
+    // to be running). CHAIN_DATA_DIR keeps the temp footprint
     // contained — no state leaks into ~/.fai.
     final process = await Process.start(
       binary,
       ['serve', '--bind', addr],
       environment: {
         ...Platform.environment,
-        'FAI_DATA_DIR': tempDir.path,
-        'FAI_MODULES_DIR': '${tempDir.path}/modules',
+        'CHAIN_DATA_DIR': tempDir.path,
+        'CHAIN_MODULES_DIR': '${tempDir.path}/modules',
         // Suppress info logs without a CLI flag — the binary
         // respects RUST_LOG for tracing-subscriber.
         'RUST_LOG': 'warn',
@@ -136,7 +136,7 @@ class HubFixture {
     await tempDir.delete(recursive: true);
     throw StateError(
       'Hub did not become healthy within $readyTimeout. '
-      'Check `fai serve` works manually with FAI_DATA_DIR=$tempDir.',
+      'Check `fai serve` works manually with CHAIN_DATA_DIR=$tempDir.',
     );
   }
 
@@ -172,8 +172,8 @@ class HubFixture {
     }
 
     final candidate = Platform.isWindows
-        ? '../fai_platform/target/release/fai.exe'
-        : '../fai_platform/target/release/fai';
+        ? '../chain_platform/target/release/fai.exe'
+        : '../chain_platform/target/release/fai';
     final f = File(candidate);
     if (await f.exists()) {
       return f.absolute.path;
diff --git a/test/integration/plugin_theme_test.dart b/test/integration/plugin_theme_test.dart
index 1457bf3..1a7e796 100644
--- a/test/integration/plugin_theme_test.dart
+++ b/test/integration/plugin_theme_test.dart
@@ -10,9 +10,9 @@
 //   flutter test test/integration/plugin_theme_test.dart
 //
 // Pre-reqs (handled by HubFixture's skip-when-missing path):
-//   - fai binary on PATH or at ../fai_platform/target/release/fai
+//   - fai binary on PATH or at ../chain_platform/target/release/fai
 //   - studio-theme-solarized plugin built to module.wasm in its
-//     fai_plugins dir.
+//     chain_plugins dir.
 
 import 'dart:io';
 
@@ -33,7 +33,7 @@ void main() {
         // add network + bundle-fetch latency that doesn't
         // belong in an in-process round-trip test.
         final pluginSrc = Directory(
-          '../fai_plugins/studio-theme-solarized',
+          '../chain_plugins/studio-theme-solarized',
         );
         if (!await pluginSrc.exists()) {
           markTestSkipped('studio-theme-solarized source not available');
diff --git a/test/load_docs_test.dart b/test/load_docs_test.dart
index 3960cde..f113a7c 100644
--- a/test/load_docs_test.dart
+++ b/test/load_docs_test.dart
@@ -7,7 +7,7 @@ import 'package:chain_studio/l10n/app_localizations.dart';
 import 'package:chain_studio/theme/theme.dart';
 
 /// Recreates the exact DocReaderSheet code path that
-/// welcome.dart uses, including FaiTheme.markdownStyle, so a
+/// welcome.dart uses, including ChainTheme.markdownStyle, so a
 /// regression in either rootBundle, the markdown parser, or
 /// the style sheet surfaces here instead of only at runtime
 /// when an operator clicks a doc card.
@@ -16,7 +16,7 @@ void main() {
 
   testWidgets('DocReaderSheet renders all four german + english docs',
       (tester) async {
-    final theme = FaiTheme.light();
+    final theme = ChainTheme.light();
     for (final slug in ['architecture', 'security', 'audit', 'flows']) {
       for (final locale in ['de', 'en']) {
         final path = locale == 'de'
@@ -39,7 +39,7 @@ void main() {
               data: text,
               padding: const EdgeInsets.all(8),
               selectable: true,
-              styleSheet: FaiTheme.markdownStyle(theme),
+              styleSheet: ChainTheme.markdownStyle(theme),
             ),
           ),
         ));
diff --git a/tools/today/README.md b/tools/today/README.md
index a386e6b..61cb78f 100644
--- a/tools/today/README.md
+++ b/tools/today/README.md
@@ -51,10 +51,10 @@ A starter plist lives at `launchd/ai.flemming.chain.today.plist`.
 
 | Variable          | Default                          | Example                                         |
 |-------------------|----------------------------------|-------------------------------------------------|
-| `FAI_TODAY_API`   | `http://127.0.0.1:11434/api/generate` | `https://api.openai.com/v1/chat/completions` |
-| `FAI_TODAY_MODEL` | `gemma3:4b`                      | `gpt-4o-mini`                                   |
-| `FAI_TODAY_KEY`   | (unset)                          | `$OPENAI_API_KEY`                               |
-| `FAI_TODAY_N`     | `3`                              | `1` (single shot)                               |
+| `CHAIN_TODAY_API`   | `http://127.0.0.1:11434/api/generate` | `https://api.openai.com/v1/chat/completions` |
+| `CHAIN_TODAY_MODEL` | `gemma3:4b`                      | `gpt-4o-mini`                                   |
+| `CHAIN_TODAY_KEY`   | (unset)                          | `$OPENAI_API_KEY`                               |
+| `CHAIN_TODAY_N`     | `3`                              | `1` (single shot)                               |
 
 OpenAI-compatible endpoints will work as long as they speak `chat/completions`
 or `generate`; the script auto-detects from the URL path.
diff --git a/tools/today/collect.sh b/tools/today/collect.sh
index 4d0430b..0fd0832 100755
--- a/tools/today/collect.sh
+++ b/tools/today/collect.sh
@@ -9,7 +9,7 @@
 # Does not read the audit log without --with-audit.
 set -euo pipefail
 
-SINCE="${FAI_TODAY_SINCE:-24 hours ago}"
+SINCE="${CHAIN_TODAY_SINCE:-24 hours ago}"
 
 # Walk every fai-* directory next to chain_studio so the collector
 # works from any of the sibling checkouts. Adjust here if the
@@ -31,10 +31,10 @@ for repo in "$ROOT"/fai_*/; do
 done
 
 emit_section "STORE INDEX SEED CHANGES"
-seed="$ROOT/fai_platform/crates/fai_hub/store-index/seed.yaml"
-if [ -f "$seed" ] && [ -d "$ROOT/fai_platform/.git" ]; then
-  diff=$(git -C "$ROOT/fai_platform" log --since="$SINCE" --oneline -- \
-    crates/fai_hub/store-index/seed.yaml 2>/dev/null || true)
+seed="$ROOT/fai_chain/crates/chain_hub/store-index/seed.yaml"
+if [ -f "$seed" ] && [ -d "$ROOT/fai_chain/.git" ]; then
+  diff=$(git -C "$ROOT/fai_chain" log --since="$SINCE" --oneline -- \
+    crates/chain_hub/store-index/seed.yaml 2>/dev/null || true)
   if [ -n "$diff" ]; then
     printf '%s\n' "$diff"
   else
@@ -43,9 +43,9 @@ if [ -f "$seed" ] && [ -d "$ROOT/fai_platform/.git" ]; then
 fi
 
 emit_section "ARCHITECTURE / SYSTEM-GAPS CHANGES"
-arch_dir="$ROOT/fai_platform/docs"
-if [ -d "$arch_dir" ] && [ -d "$ROOT/fai_platform/.git" ]; then
-  changes=$(git -C "$ROOT/fai_platform" log --since="$SINCE" --oneline -- \
+arch_dir="$ROOT/fai_chain/docs"
+if [ -d "$arch_dir" ] && [ -d "$ROOT/fai_chain/.git" ]; then
+  changes=$(git -C "$ROOT/fai_chain" log --since="$SINCE" --oneline -- \
     docs/architecture docs/advanced 2>/dev/null || true)
   if [ -n "$changes" ]; then
     printf '%s\n' "$changes"
@@ -67,9 +67,9 @@ if [ -d "$studio/.git" ]; then
 fi
 
 emit_section "AUDIT-LOG HIGHLIGHTS"
-if [ "${FAI_TODAY_WITH_AUDIT:-0}" = "1" ] && command -v fai >/dev/null 2>&1; then
+if [ "${CHAIN_TODAY_WITH_AUDIT:-0}" = "1" ] && command -v fai >/dev/null 2>&1; then
   fai audit recent --limit 20 2>/dev/null | head -40 || \
     printf '(audit query failed; daemon may be stopped)\n'
 else
-  printf '(audit pull disabled — set FAI_TODAY_WITH_AUDIT=1 to opt in)\n'
+  printf '(audit pull disabled — set CHAIN_TODAY_WITH_AUDIT=1 to opt in)\n'
 fi
diff --git a/tools/today/propose.sh b/tools/today/propose.sh
index 942590b..95946ed 100755
--- a/tools/today/propose.sh
+++ b/tools/today/propose.sh
@@ -5,17 +5,17 @@
 # Defaults to a local Ollama at 127.0.0.1:11434 with gemma3:4b.
 # See README.md for env-var overrides.
 #
-# Output:  ~/.fai/today/proposals/<ISO-DATE>/candidate-<n>.yaml
+# Output:  ~/.chain/today/proposals/<ISO-DATE>/candidate-<n>.yaml
 # Operator then runs accept.sh with the chosen file.
 set -euo pipefail
 
 HERE="$(cd "$(dirname "$0")" && pwd)"
 DATE="$(date -u +%Y-%m-%d)"
-OUT_DIR="${FAI_TODAY_OUT:-$HOME/.fai/today/proposals/$DATE}"
-N="${FAI_TODAY_N:-3}"
-API="${FAI_TODAY_API:-http://127.0.0.1:11434/api/generate}"
-MODEL="${FAI_TODAY_MODEL:-gemma3:4b}"
-KEY="${FAI_TODAY_KEY:-}"
+OUT_DIR="${CHAIN_TODAY_OUT:-$HOME/.chain/today/proposals/$DATE}"
+N="${CHAIN_TODAY_N:-3}"
+API="${CHAIN_TODAY_API:-http://127.0.0.1:11434/api/generate}"
+MODEL="${CHAIN_TODAY_MODEL:-gemma3:4b}"
+KEY="${CHAIN_TODAY_KEY:-}"
 
 mkdir -p "$OUT_DIR"