diff --git a/CHANGELOG.md b/CHANGELOG.md
index 617635b..f74b4ea 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -61,7 +61,7 @@ version + `kStudioVersion` in `lib/main.dart` stay in lockstep.
 
 - **Add-module-source dialog** for private modules that
   aren't in the public store. Asks for URL or local `.fai`
-  bundle path; carries an explainer block + `fai install --link`
+  bundle path; carries an explainer block + `chain install --link`
   example.
 - **Store catalogue** passed to the flow editor so the
   analyzer can decide between Install (in store) and Add
diff --git a/README.md b/README.md
index b37affb..7793600 100644
--- a/README.md
+++ b/README.md
@@ -1,8 +1,8 @@
-# F∆I Studio
+# Ch∆In Studio
 
-Desktop GUI client for the F∆I Platform hub. Tier-2 generic
+Desktop GUI client for the Ch∆In Platform hub. Tier-2 generic
 platform client per `docs/architecture/client.md`. Connects to a
-local or remote `fai serve` over gRPC.
+local or remote `chain serve` over gRPC.
 
 > **Status (2026-05-05):** MVP scaffold. Three pages with mock
 > data, no live gRPC connection yet. Validates the visual
diff --git a/assets/docs/architecture.md b/assets/docs/architecture.md
index 998fe27..c7a2488 100644
--- a/assets/docs/architecture.md
+++ b/assets/docs/architecture.md
@@ -1,6 +1,6 @@
 # Architecture in one paragraph
 
-F∆I has three concepts you'll meet everywhere: **Hub**,
+Ch∆In has three concepts you'll meet everywhere: **Hub**,
 **Module**, **Flow**.
 
 **The hub** is a single Rust binary called `fai`. It runs as a
@@ -39,7 +39,7 @@ Studio ──gRPC──▶ Hub ──loads──▶ Module (WASM)
   or Podman. Modules are WASM components loaded in-process.
 - No external database. SQLite ships with the hub.
 - No background services. One process; restart with
-  `fai daemon restart` — see Doctor → Daemon control.
+  `chain daemon restart` — see Doctor → Daemon control.
 
 ## Where to go next in this app
 
diff --git a/assets/docs/architecture_de.md b/assets/docs/architecture_de.md
index 3409d9c..74c565e 100644
--- a/assets/docs/architecture_de.md
+++ b/assets/docs/architecture_de.md
@@ -1,6 +1,6 @@
 # Architektur in einem Absatz
 
-F∆I hat drei Konzepte, die dir überall begegnen: **Hub**,
+Ch∆In hat drei Konzepte, die dir überall begegnen: **Hub**,
 **Modul**, **Flow**.
 
 **Der Hub** ist ein einzelnes Rust-Binary namens `fai`. Er
@@ -42,7 +42,7 @@ Studio ──gRPC──▶ Hub ──lädt──▶ Modul (WASM)
   Module sind WASM-Komponenten, in-process geladen.
 - Keine externe Datenbank. SQLite kommt mit dem Hub.
 - Keine Hintergrunddienste. Ein Prozess; Neustart per
-  `fai daemon restart` — siehe Diagnose → Daemon-Steuerung.
+  `chain daemon restart` — siehe Diagnose → Daemon-Steuerung.
 
 ## Wo es in dieser App weitergeht
 
diff --git a/assets/docs/audit.md b/assets/docs/audit.md
index 03822cd..021aa12 100644
--- a/assets/docs/audit.md
+++ b/assets/docs/audit.md
@@ -37,7 +37,7 @@ WORM-1 is our first WORM (write-once-read-many) tier:
   beta / production channels.
 - **Tamper-evident**: the chain reveals any retroactive edit.
   Verification runs end-to-end on every Doctor-page load and
-  via `fai admin verify-events`.
+  via `chain admin verify-events`.
 - **Self-contained**: SQLite + chain hash is enough; no
   external WORM sink needed.
 
@@ -60,7 +60,7 @@ WORM sink) are roadmap items, not yet shipped.
 If you want to verify outside Studio:
 
 ```bash
-fai admin verify-events
+chain admin verify-events
 # Prints "Hash chain intact: N events verified" or names the
 # first event whose hash mismatches.
 ```
diff --git a/assets/docs/audit_de.md b/assets/docs/audit_de.md
index 8b0c6a7..55f0b62 100644
--- a/assets/docs/audit_de.md
+++ b/assets/docs/audit_de.md
@@ -38,7 +38,7 @@ WORM-1 ist unsere erste WORM-Stufe (write-once-read-many):
   beta-/production-Kanälen verweigert.
 - **Manipulationssicher**: Die Kette zeigt jede nachträgliche
   Änderung. Verifikation läuft bei jedem Doctor-Page-Load
-  komplett und über `fai admin verify-events`.
+  komplett und über `chain admin verify-events`.
 - **Selbst-tragend**: SQLite + Ketten-Hash genügen; keine
   externe WORM-Senke nötig.
 
@@ -61,7 +61,7 @@ WORM-Senke) sind Roadmap-Punkte, noch nicht ausgeliefert.
 Wer außerhalb von Studio verifizieren will:
 
 ```bash
-fai admin verify-events
+chain admin verify-events
 # Druckt „Hash-Kette intakt: N Events verifiziert" oder nennt
 # das erste Event, dessen Hash nicht passt.
 ```
diff --git a/assets/docs/flows.md b/assets/docs/flows.md
index 1bbe82e..66bb468 100644
--- a/assets/docs/flows.md
+++ b/assets/docs/flows.md
@@ -25,7 +25,7 @@ outputs:
   greeting: "{{ steps.greet.outputs.payload }}"
 ```
 
-`fai run flows/hello.yaml --input name=World` produces:
+`chain run flows/hello.yaml --input name=World` produces:
 
 ```json
 { "greeting": "Hello, World" }
diff --git a/assets/docs/flows_de.md b/assets/docs/flows_de.md
index 2725937..123e322 100644
--- a/assets/docs/flows_de.md
+++ b/assets/docs/flows_de.md
@@ -26,7 +26,7 @@ outputs:
   greeting: "{{ steps.greet.outputs.payload }}"
 ```
 
-`fai run flows/hello.yaml --input name=Welt` ergibt:
+`chain run flows/hello.yaml --input name=Welt` ergibt:
 
 ```json
 { "greeting": "Hallo, Welt" }
diff --git a/assets/docs/security.md b/assets/docs/security.md
index ca6280b..838b2e7 100644
--- a/assets/docs/security.md
+++ b/assets/docs/security.md
@@ -1,6 +1,6 @@
 # Sandbox model
 
-Every F∆I module runs inside a WebAssembly sandbox with no
+Every Ch∆In module runs inside a WebAssembly sandbox with no
 ambient access to the host. The module can do exactly what it
 declares in its `module.yaml` — and nothing else.
 
diff --git a/assets/docs/security_de.md b/assets/docs/security_de.md
index 446313a..3ec033c 100644
--- a/assets/docs/security_de.md
+++ b/assets/docs/security_de.md
@@ -1,6 +1,6 @@
 # Sandbox-Modell
 
-Jedes F∆I-Modul läuft in einer WebAssembly-Sandbox ohne
+Jedes Ch∆In-Modul läuft in einer WebAssembly-Sandbox ohne
 ambienten Hostzugriff. Das Modul kann genau das, was es in
 seiner `module.yaml` deklariert — und sonst nichts.
 
diff --git a/docs/landing-page-design.md b/docs/landing-page-design.md
index 39eee96..73df811 100644
--- a/docs/landing-page-design.md
+++ b/docs/landing-page-design.md
@@ -12,7 +12,7 @@ content:
   store / federation items the operator can act on.
 - **Architecture education**: "every module is sandboxed",
   "the audit log is hash-chained", "the hub fits in one
-  binary, no Docker". These are *what F∆I is* — they belong
+  binary, no Docker". These are *what Ch∆In is* — they belong
   on a Welcome page that introduces the platform on first
   launch and stays available afterwards as a reference.
 
@@ -41,7 +41,7 @@ returning operators can come back any time.
 ├──────────────────────────────────────────────────────────┤
 │  ┌────────────────────────────────────────────────────┐ │
 │  │  HERO                                               │ │
-│  │  F∆I Platform                                       │ │
+│  │  Ch∆In Platform                                       │ │
 │  │  Deterministic workflow engine for AI-assisted     │ │
 │  │  document processing in regulated environments.    │ │
 │  └────────────────────────────────────────────────────┘ │
diff --git a/docs/today-pipeline.md b/docs/today-pipeline.md
index 5f312e3..bef932e 100644
--- a/docs/today-pipeline.md
+++ b/docs/today-pipeline.md
@@ -108,7 +108,7 @@ The prompt template (`tools/today/prompt.template.md`) hard-encodes:
 ## Out of scope (Phase 0.5)
 
 - Multi-story rotation (one active story at a time).
-- A/B-testing or click-through tracking — F∆I has no surveillance budget
+- A/B-testing or click-through tracking — Ch∆In has no surveillance budget
   and no telemetry pipeline to feed it into.
 - Auto-publication to git (operator-curated boundary stays manual).
 - Hub-served stories. Studio reads `~/.fai/today/active.yaml` directly
diff --git a/lib/data/error_presentation.dart b/lib/data/error_presentation.dart
index 2e372c2..131f5e6 100644
--- a/lib/data/error_presentation.dart
+++ b/lib/data/error_presentation.dart
@@ -24,7 +24,7 @@ import 'fai_log.dart';
 ///
 /// [source] is a short tag (`flows.run`, `audit.clear`, …)
 /// used to group entries in the on-disk log so an operator or
-/// `fai doctor` can scan recent failures by area without
+/// `chain doctor` can scan recent failures by area without
 /// reading the full free-text. Keep it stable; treat it like
 /// a metric label, not free-form text.
 ///
diff --git a/lib/data/fai_log.dart b/lib/data/fai_log.dart
index ba22b9f..e442e8f 100644
--- a/lib/data/fai_log.dart
+++ b/lib/data/fai_log.dart
@@ -1,12 +1,12 @@
 // Central error log for Studio. Every error surfaced to the
 // operator (SnackBar, error sheet, recoverable dialog) is also
-// appended here so `fai doctor` and "Open log" can show what
+// appended here so `chain doctor` and "Open log" can show what
 // went wrong without the operator having to reproduce the
 // failure.
 //
 // Path: `~/.fai/logs/studio-errors.log` (cross-platform via
 // HOME / USERPROFILE). One line per event, JSON-shaped so
-// `fai doctor` can parse it; humans can still read it because
+// `chain doctor` can parse it; humans can still read it because
 // the JSON is single-line and short.
 //
 // Best-effort by design: a failed write to the log file must
@@ -76,7 +76,7 @@ class FaiLog {
     return _append(entry);
   }
 
-  /// Read the last [maxLines] lines back. Used by `fai doctor`
+  /// Read the last [maxLines] lines back. Used by `chain doctor`
   /// + Settings → "Recent errors" view. Returns oldest first so
   /// the caller can render in chronological order.
   Future<List<String>> tail({int maxLines = 50}) async {
diff --git a/lib/data/system_actions.dart b/lib/data/system_actions.dart
index 2884edd..200035e 100644
--- a/lib/data/system_actions.dart
+++ b/lib/data/system_actions.dart
@@ -11,7 +11,7 @@
 //   call for processes.
 //
 // The `fai` binary is resolved from PATH first; falls back to
-// `~/.fai/bin/fai` (Unix) or `%USERPROFILE%\.fai\bin\fai.exe`
+// `~/.fai/bin/chain` (Unix) or `%USERPROFILE%\.fai\bin\chain.exe`
 // (Windows). The PowerShell installer puts both in PATH but
 // some operators don't restart their shell after install — the
 // fallback covers that case.
@@ -26,7 +26,7 @@ import 'package:shared_preferences/shared_preferences.dart';
 /// and render a localized, actionable message instead.
 const String kFaiBinaryNotFound = 'fai-binary-not-found';
 
-/// Getting-started / install guide for the F∆I platform. Opened
+/// Getting-started / install guide for the Ch∆In platform. Opened
 /// in the OS browser as the fallback affordance when no `fai`
 /// binary can be located on the machine.
 const String kFaiInstallDocsUrl =
@@ -135,7 +135,7 @@ class SystemActions {
     return revealInOs(path);
   }
 
-  /// Run a `fai daemon ...` subcommand and surface the captured
+  /// 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(
     List<String> args,
@@ -143,7 +143,7 @@ class SystemActions {
     return _runFai(['daemon', ...args]);
   }
 
-  /// Run `fai update apply --channel <c>`. Long-running on a slow
+  /// 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(
     String channel,
@@ -177,7 +177,7 @@ class SystemActions {
     return _runFai(['daemon', 'disable', '--channel', channel]);
   }
 
-  /// Run `fai reset --yes`. Wipes operator state with the same
+  /// Run `chain reset --yes`. Wipes operator state with the same
   /// safety net as the CLI: stops every daemon (including off-
   /// channel orphans), atomically backs `~/.fai/` up, recreates
   /// it with `bin/`, `channels/`, `config.yaml`, `current-channel`,
@@ -249,7 +249,7 @@ class SystemActions {
     if (home == null || home.isEmpty) return null;
     final fallback = isWindows
         ? '$home\\.fai\\bin\\fai.exe'
-        : '$home/.fai/bin/fai';
+        : '$home/.fai/bin/chain';
     return File(fallback).existsSync() ? fallback : null;
   }
 
diff --git a/lib/l10n/app_de.arb b/lib/l10n/app_de.arb
index 5b7dda8..7eac8d1 100644
--- a/lib/l10n/app_de.arb
+++ b/lib/l10n/app_de.arb
@@ -1,8 +1,8 @@
 {
   "@@locale": "de",
-  "appTitle": "F∆I Studio",
+  "appTitle": "Ch∆In Studio",
   "navWelcome": "Willkommen",
-  "welcomeHeroTitle": "F∆I Platform",
+  "welcomeHeroTitle": "Ch∆In Platform",
   "welcomeHeroSubtitle": "Deterministische Workflow-Engine für KI-gestützte Dokumentenverarbeitung in regulierten Umgebungen.",
   "welcomePillarHubTitle": "Hub",
   "welcomePillarHubBody": "Ein Rust-Binary, das Module lädt und Flows ausführt. SQLite für den State. Kein Docker, kein Message-Broker, keine Hintergrunddienste, die gepflegt werden müssen.",
@@ -60,7 +60,7 @@
   "welcomeChecklistMcp": "Öffentliche Capability-Quelle hinzufügen",
   "welcomeChecklistMcpHint": "Im Store eine MCP-Quelle hinzufügen oder unter Einstellungen → MCP-Clients konfigurieren.",
   "welcomeChecklistModule": "Ein Text-Modul installieren",
-  "welcomeChecklistModuleHint": "Im Store ein Modul aus der Kategorie deiner Wahl installieren. Module sind sandboxed F∆I-Komponenten.",
+  "welcomeChecklistModuleHint": "Im Store ein Modul aus der Kategorie deiner Wahl installieren. Module sind sandboxed Ch∆In-Komponenten.",
   "welcomeChecklistFlow": "Einen gespeicherten Flow starten",
   "welcomeChecklistFlowHint": "Flows → einen wählen → Starten. Studio bringt einige Demo-Flows mit; auch ein eigener tut's.",
   "welcomeChecklistAllDone": "Alle vier Schritte erledigt.",
@@ -320,7 +320,7 @@
   },
   "storeReloadTooltip": "Aktualisieren",
   "storeTodayBadge": "HEUTE",
-  "storeTodayDeck": "Von der F∆I-Redaktion",
+  "storeTodayDeck": "Von der Ch∆In-Redaktion",
   "storeTodayDismissTooltip": "Für diese Sitzung ausblenden",
   "storePillInstalled": "installiert",
   "storePillUpdate": "Update",
@@ -607,7 +607,7 @@
   "auditClearLogButton": "Log löschen",
   "modulesTitle": "Module",
   "modulesNoneTitle": "Noch keine Module",
-  "modulesNoneHint": "`fai install <capability-name>` ausführen oder ~/.fai/modules/ prüfen.",
+  "modulesNoneHint": "`chain install <capability-name>` ausführen oder ~/.fai/modules/ prüfen.",
   "modulesReloadTooltip": "Aktualisieren",
   "modulesRecentActivity": "LETZTE AKTIVITÄT",
   "modulesRecentActivityHint": "letzte {n} install/uninstall-Ereignisse aus dem Audit-Log",
@@ -667,7 +667,7 @@
   "flowsTitle": "Flows",
   "flowsReloadTooltip": "Aktualisieren",
   "flowsNoneTitle": "Keine gespeicherten Flows",
-  "flowsNoneHint": "Flow speichern mit `fai admin flows save <name> <flow.yaml>`, dann taucht er hier auf.",
+  "flowsNoneHint": "Flow speichern mit `chain admin flows save <name> <flow.yaml>`, dann taucht er hier auf.",
   "flowsRunDialogTitle": "{name} ausführen",
   "@flowsRunDialogTitle": {
     "placeholders": {
@@ -849,7 +849,7 @@
   "welcomeChecklistNextTodayBody": "tools/today/propose.sh per Cron laufen lassen und die Editorial-Karte im Store füllt sich mit operator-kuratierten Stories.",
   "welcomeChecklistNextTodayButton": "Today-Doku öffnen",
   "welcomeChecklistNextModuleTitle": "Eigenes Modul bauen",
-  "welcomeChecklistNextModuleBody": "Mit `fai new module <name>` ein Rust+WASM-Scaffold erzeugen. Das module-sdk übernimmt die WIT-Plumbing; du schreibst nur ein typisiertes invoke.",
+  "welcomeChecklistNextModuleBody": "Mit `chain new module <name>` ein Rust+WASM-Scaffold erzeugen. Das module-sdk übernimmt die WIT-Plumbing; du schreibst nur ein typisiertes invoke.",
   "welcomeChecklistNextModuleButton": "Doku lesen",
   "auditGroupToday": "HEUTE",
   "auditGroupYesterday": "GESTERN",
@@ -954,7 +954,7 @@
   "errInternal": "Unerwarteter interner Fehler.",
   "errInternalHint": "Hub-Logs unter `~/.fai/logs/` prüfen. Wenn das öfter passiert, bitte melden.",
   "errUnavailable": "Hub nicht erreichbar.",
-  "errUnavailableHint": "Sicherstellen, dass `fai serve` (oder `fai daemon start`) läuft und der Daemon-Endpunkt zu Studios Einstellungen passt.",
+  "errUnavailableHint": "Sicherstellen, dass `chain serve` (oder `chain daemon start`) läuft und der Daemon-Endpunkt zu Studios Einstellungen passt.",
   "errUnauthenticated": "Authentifizierung erforderlich.",
   "errUnauthenticatedHint": "`FAI_REGISTRY_TOKEN` setzen oder in den Einstellungen anmelden, dann erneut versuchen.",
   "errCopyDetail": "Detail kopieren",
@@ -1173,7 +1173,7 @@
   "doctorStatusUnknown": "Daemon-Status: …",
   "doctorPillRunning": "läuft",
   "doctorPillStopped": "gestoppt",
-  "doctorDaemonControlHint": "Studio ruft das Platform-Binary auf — entspricht `fai daemon …`, sodass CLI und UI im Gleichschritt bleiben.",
+  "doctorDaemonControlHint": "Studio ruft das Platform-Binary auf — entspricht `chain daemon …`, sodass CLI und UI im Gleichschritt bleiben.",
   "doctorDaemonControlWorking": "Wird ausgeführt…",
   "doctorPathLog": "Log",
   "doctorPathConfig": "Konfig",
@@ -1181,7 +1181,7 @@
   "doctorPathModules": "Module-Verzeichnis",
   "doctorPathFlows": "Flow-Verzeichnis",
   "doctorPathPid": "PID-Datei",
-  "doctorPathsEmpty": "Daemon hat keine Datei-Pfade gemeldet. Hub aktualisieren via `fai daemon restart`.",
+  "doctorPathsEmpty": "Daemon hat keine Datei-Pfade gemeldet. Hub aktualisieren via `chain daemon restart`.",
   "doctorOpenError": "Konnte nicht öffnen: {detail}",
   "@doctorOpenError": {
     "placeholders": {
@@ -1198,7 +1198,7 @@
       }
     }
   },
-  "doctorUpdateBody": "Kanal {channel} bietet jetzt {version}. Per Button anwenden — Studio ruft `fai update apply --channel {channel}` auf.",
+  "doctorUpdateBody": "Kanal {channel} bietet jetzt {version}. Per Button anwenden — Studio ruft `chain update apply --channel {channel}` auf.",
   "@doctorUpdateBody": {
     "placeholders": {
       "channel": {
@@ -1238,7 +1238,7 @@
   "n8nHint": "Aktive n8n-Workflows erscheinen als `n8n.<endpoint>.<slug>` Fähigkeiten. Einmal konfigurieren, im Store sichtbar.",
   "n8nEmpty": "Keine n8n-Endpunkte konfiguriert. + klicken zum Hinzufügen.",
   "hubUnreachable": "Hub nicht erreichbar",
-  "hubUnreachableHint": "Hub starten mit `fai serve`.",
+  "hubUnreachableHint": "Hub starten mit `chain serve`.",
   "languageEnglish": "English",
   "languageGerman": "Deutsch",
   "searchHint": "Springe überall hin — Module, Store, Flows, Seiten…",
@@ -1511,8 +1511,8 @@
   "addSourceField": "URL oder Pfad zum .fai-Bundle",
   "addSourceHint": "https://git.flemming.ai/deine-org/dein-modul/releases/download/v0.1.0/foo-0.1.0.fai",
   "addSourceHowItWorksTitle": "Wie private Module funktionieren",
-  "addSourceHowItWorksBody": "Ein Modul ist ein Verzeichnis mit module.yaml + WASM-Artefakt. Zum Teilen: `fai pack <verzeichnis>` baut ein `.fai`-Bundle, das du beliebig hosten kannst (eigene Forgejo / GitHub / S3). Der Hub installiert per URL und prüft die Signatur gegen seinen Trust-Store.\n\nLokal entwickeln? Nimm das CLI — Studio installiert (noch) nicht aus einem unverpackten Verzeichnis:",
-  "addSourceCliExample": "fai install --link /pfad/zum/modul",
+  "addSourceHowItWorksBody": "Ein Modul ist ein Verzeichnis mit module.yaml + WASM-Artefakt. Zum Teilen: `chain pack <verzeichnis>` baut ein `.fai`-Bundle, das du beliebig hosten kannst (eigene Forgejo / GitHub / S3). Der Hub installiert per URL und prüft die Signatur gegen seinen Trust-Store.\n\nLokal entwickeln? Nimm das CLI — Studio installiert (noch) nicht aus einem unverpackten Verzeichnis:",
+  "addSourceCliExample": "chain install --link /pfad/zum/modul",
   "addSourceInstallButton": "Installieren",
   "addSourceCancel": "Abbrechen",
   "installFailed": "Installation fehlgeschlagen: {error}",
@@ -1540,7 +1540,7 @@
     }
   },
   "faiBinaryNotFound": "Das Programm `fai` wurde auf diesem Rechner nicht gefunden.",
-  "faiBinaryNotFoundHint": "Installiere die F∆I-Plattform oder verweise Studio auf eine vorhandene `fai`-Datei.",
+  "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",
diff --git a/lib/l10n/app_en.arb b/lib/l10n/app_en.arb
index 0be3e46..058c1bd 100644
--- a/lib/l10n/app_en.arb
+++ b/lib/l10n/app_en.arb
@@ -1,11 +1,11 @@
 {
   "@@locale": "en",
-  "appTitle": "F∆I Studio",
+  "appTitle": "Ch∆In Studio",
   "@appTitle": {
     "description": "App-bar title in the OS task switcher."
   },
   "navWelcome": "Welcome",
-  "welcomeHeroTitle": "F∆I Platform",
+  "welcomeHeroTitle": "Ch∆In Platform",
   "welcomeHeroSubtitle": "Deterministic workflow engine for AI-assisted document processing in regulated environments.",
   "welcomePillarHubTitle": "Hub",
   "welcomePillarHubBody": "One Rust binary that loads modules and runs flows. SQLite for state. No Docker, no message broker, no background services to babysit.",
@@ -63,7 +63,7 @@
   "welcomeChecklistMcp": "Add a public capability source",
   "welcomeChecklistMcpHint": "Add an MCP source from the Store, or configure one under Settings → MCP Clients.",
   "welcomeChecklistModule": "Install a text module",
-  "welcomeChecklistModuleHint": "Install a module from the Store — pick whichever category fits your work. Modules are sandboxed F∆I components.",
+  "welcomeChecklistModuleHint": "Install a module from the Store — pick whichever category fits your work. Modules are sandboxed Ch∆In components.",
   "welcomeChecklistFlow": "Run a saved flow",
   "welcomeChecklistFlowHint": "Flows → pick one → Run. Studio ships a few demo flows; one of your own works too.",
   "welcomeChecklistAllDone": "All four steps complete.",
@@ -323,7 +323,7 @@
   },
   "storeReloadTooltip": "Reload",
   "storeTodayBadge": "TODAY",
-  "storeTodayDeck": "From the F∆I editor",
+  "storeTodayDeck": "From the Ch∆In editor",
   "storeTodayDismissTooltip": "Hide for this session",
   "storePillInstalled": "installed",
   "storePillUpdate": "update",
@@ -610,7 +610,7 @@
   "auditClearLogButton": "Clear log",
   "modulesTitle": "Modules",
   "modulesNoneTitle": "No modules yet",
-  "modulesNoneHint": "Run `fai install <capability-name>` or check ~/.fai/modules/.",
+  "modulesNoneHint": "Run `chain install <capability-name>` or check ~/.fai/modules/.",
   "modulesReloadTooltip": "Reload",
   "modulesRecentActivity": "RECENT ACTIVITY",
   "modulesRecentActivityHint": "last {n} install/uninstall events from the audit log",
@@ -670,7 +670,7 @@
   "flowsTitle": "Flows",
   "flowsReloadTooltip": "Reload",
   "flowsNoneTitle": "No saved flows",
-  "flowsNoneHint": "Save a flow with `fai admin flows save <name> <flow.yaml>` and it shows up here.",
+  "flowsNoneHint": "Save a flow with `chain admin flows save <name> <flow.yaml>` and it shows up here.",
   "flowsRunDialogTitle": "Run {name}",
   "@flowsRunDialogTitle": {
     "placeholders": {
@@ -852,7 +852,7 @@
   "welcomeChecklistNextTodayBody": "Run tools/today/propose.sh on a cron and the editorial card on the store auto-fills with operator-curated narratives.",
   "welcomeChecklistNextTodayButton": "Open Today docs",
   "welcomeChecklistNextModuleTitle": "Build your own module",
-  "welcomeChecklistNextModuleBody": "Generate a Rust+WASM scaffold with `fai new module <name>`. The module-sdk handles the WIT plumbing; you write a typed invoke.",
+  "welcomeChecklistNextModuleBody": "Generate a Rust+WASM scaffold with `chain new module <name>`. The module-sdk handles the WIT plumbing; you write a typed invoke.",
   "welcomeChecklistNextModuleButton": "Read the docs",
   "auditGroupToday": "TODAY",
   "auditGroupYesterday": "YESTERDAY",
@@ -957,7 +957,7 @@
   "errInternal": "Unexpected internal error.",
   "errInternalHint": "Check the hub logs at `~/.fai/logs/`. If this repeats, please report it.",
   "errUnavailable": "Hub not reachable.",
-  "errUnavailableHint": "Make sure `fai serve` (or `fai daemon start`) is running and the daemon endpoint matches Studio's settings.",
+  "errUnavailableHint": "Make sure `chain serve` (or `chain daemon start`) is running and the daemon endpoint matches Studio's settings.",
   "errUnauthenticated": "Authentication required.",
   "errUnauthenticatedHint": "Set `FAI_REGISTRY_TOKEN` or sign in through Settings before retrying.",
   "errCopyDetail": "Copy detail",
@@ -1176,7 +1176,7 @@
   "doctorStatusUnknown": "Daemon status: …",
   "doctorPillRunning": "running",
   "doctorPillStopped": "stopped",
-  "doctorDaemonControlHint": "Studio shells out to the platform binary — mirrors `fai daemon …` exactly so the CLI and UI stay in lockstep.",
+  "doctorDaemonControlHint": "Studio shells out to the platform binary — mirrors `chain daemon …` exactly so the CLI and UI stay in lockstep.",
   "doctorDaemonControlWorking": "Working…",
   "doctorPathLog": "Log",
   "doctorPathConfig": "Config",
@@ -1184,7 +1184,7 @@
   "doctorPathModules": "Modules dir",
   "doctorPathFlows": "Flows dir",
   "doctorPathPid": "PID file",
-  "doctorPathsEmpty": "Daemon did not report file paths. Update the running hub via `fai daemon restart`.",
+  "doctorPathsEmpty": "Daemon did not report file paths. Update the running hub via `chain daemon restart`.",
   "doctorOpenError": "Could not open: {detail}",
   "@doctorOpenError": {
     "placeholders": {
@@ -1201,7 +1201,7 @@
       }
     }
   },
-  "doctorUpdateBody": "Channel {channel} now offers {version}. Apply via the button — Studio shells out to `fai update apply --channel {channel}`.",
+  "doctorUpdateBody": "Channel {channel} now offers {version}. Apply via the button — Studio shells out to `chain update apply --channel {channel}`.",
   "@doctorUpdateBody": {
     "placeholders": {
       "channel": {
@@ -1241,7 +1241,7 @@
   "n8nHint": "Active n8n workflows surface as `n8n.<endpoint>.<slug>` capabilities. Configure once, see them in the Store.",
   "n8nEmpty": "No n8n endpoints configured. Click + to add one.",
   "hubUnreachable": "Hub unreachable",
-  "hubUnreachableHint": "Start the hub with `fai serve`.",
+  "hubUnreachableHint": "Start the hub with `chain serve`.",
   "languageEnglish": "English",
   "languageGerman": "Deutsch",
   "searchHint": "Jump anywhere — modules, store, flows, pages…",
@@ -1514,8 +1514,8 @@
   "addSourceField": "URL or path to .fai bundle",
   "addSourceHint": "https://git.flemming.ai/your-org/your-module/releases/download/v0.1.0/foo-0.1.0.fai",
   "addSourceHowItWorksTitle": "How private modules work",
-  "addSourceHowItWorksBody": "A module is a directory with a module.yaml + the WASM artifact. To share it: pack it (`fai pack <dir>`) and host the resulting `.fai` bundle anywhere (your own Forgejo / GitHub / S3). The hub installs by URL and verifies the signature against its trust store.\n\nDeveloping locally? Use the CLI — Studio cannot install from an unpacked directory (yet):",
-  "addSourceCliExample": "fai install --link /path/to/module",
+  "addSourceHowItWorksBody": "A module is a directory with a module.yaml + the WASM artifact. To share it: pack it (`chain pack <dir>`) and host the resulting `.fai` bundle anywhere (your own Forgejo / GitHub / S3). The hub installs by URL and verifies the signature against its trust store.\n\nDeveloping locally? Use the CLI — Studio cannot install from an unpacked directory (yet):",
+  "addSourceCliExample": "chain install --link /path/to/module",
   "addSourceInstallButton": "Install",
   "addSourceCancel": "Cancel",
   "installFailed": "Install failed: {error}",
@@ -1543,7 +1543,7 @@
     }
   },
   "faiBinaryNotFound": "Could not find the `fai` program on this machine.",
-  "faiBinaryNotFoundHint": "Install the F∆I platform, or point Studio at an existing `fai` binary.",
+  "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",
diff --git a/lib/l10n/app_localizations.dart b/lib/l10n/app_localizations.dart
index 748b286..6ee6009 100644
--- a/lib/l10n/app_localizations.dart
+++ b/lib/l10n/app_localizations.dart
@@ -101,7 +101,7 @@ abstract class AppLocalizations {
   /// App-bar title in the OS task switcher.
   ///
   /// In en, this message translates to:
-  /// **'F∆I Studio'**
+  /// **'Ch∆In Studio'**
   String get appTitle;
 
   /// No description provided for @navWelcome.
@@ -113,7 +113,7 @@ abstract class AppLocalizations {
   /// No description provided for @welcomeHeroTitle.
   ///
   /// In en, this message translates to:
-  /// **'F∆I Platform'**
+  /// **'Ch∆In Platform'**
   String get welcomeHeroTitle;
 
   /// No description provided for @welcomeHeroSubtitle.
@@ -419,7 +419,7 @@ abstract class AppLocalizations {
   /// No description provided for @welcomeChecklistModuleHint.
   ///
   /// In en, this message translates to:
-  /// **'Install a module from the Store — pick whichever category fits your work. Modules are sandboxed F∆I components.'**
+  /// **'Install a module from the Store — pick whichever category fits your work. Modules are sandboxed Ch∆In components.'**
   String get welcomeChecklistModuleHint;
 
   /// No description provided for @welcomeChecklistFlow.
@@ -1445,7 +1445,7 @@ abstract class AppLocalizations {
   /// No description provided for @storeTodayDeck.
   ///
   /// In en, this message translates to:
-  /// **'From the F∆I editor'**
+  /// **'From the Ch∆In editor'**
   String get storeTodayDeck;
 
   /// No description provided for @storeTodayDismissTooltip.
@@ -1991,7 +1991,7 @@ abstract class AppLocalizations {
   /// No description provided for @modulesNoneHint.
   ///
   /// In en, this message translates to:
-  /// **'Run `fai install <capability-name>` or check ~/.fai/modules/.'**
+  /// **'Run `chain install <capability-name>` or check ~/.fai/modules/.'**
   String get modulesNoneHint;
 
   /// No description provided for @modulesReloadTooltip.
@@ -2105,7 +2105,7 @@ abstract class AppLocalizations {
   /// No description provided for @flowsNoneHint.
   ///
   /// In en, this message translates to:
-  /// **'Save a flow with `fai admin flows save <name> <flow.yaml>` and it shows up here.'**
+  /// **'Save a flow with `chain admin flows save <name> <flow.yaml>` and it shows up here.'**
   String get flowsNoneHint;
 
   /// No description provided for @flowsRunDialogTitle.
@@ -2615,7 +2615,7 @@ abstract class AppLocalizations {
   /// No description provided for @welcomeChecklistNextModuleBody.
   ///
   /// In en, this message translates to:
-  /// **'Generate a Rust+WASM scaffold with `fai new module <name>`. The module-sdk handles the WIT plumbing; you write a typed invoke.'**
+  /// **'Generate a Rust+WASM scaffold with `chain new module <name>`. The module-sdk handles the WIT plumbing; you write a typed invoke.'**
   String get welcomeChecklistNextModuleBody;
 
   /// No description provided for @welcomeChecklistNextModuleButton.
@@ -2831,7 +2831,7 @@ abstract class AppLocalizations {
   /// No description provided for @errUnavailableHint.
   ///
   /// In en, this message translates to:
-  /// **'Make sure `fai serve` (or `fai daemon start`) is running and the daemon endpoint matches Studio\'s settings.'**
+  /// **'Make sure `chain serve` (or `chain daemon start`) is running and the daemon endpoint matches Studio\'s settings.'**
   String get errUnavailableHint;
 
   /// No description provided for @errUnauthenticated.
@@ -3305,7 +3305,7 @@ abstract class AppLocalizations {
   /// No description provided for @doctorDaemonControlHint.
   ///
   /// In en, this message translates to:
-  /// **'Studio shells out to the platform binary — mirrors `fai daemon …` exactly so the CLI and UI stay in lockstep.'**
+  /// **'Studio shells out to the platform binary — mirrors `chain daemon …` exactly so the CLI and UI stay in lockstep.'**
   String get doctorDaemonControlHint;
 
   /// No description provided for @doctorDaemonControlWorking.
@@ -3353,7 +3353,7 @@ abstract class AppLocalizations {
   /// No description provided for @doctorPathsEmpty.
   ///
   /// In en, this message translates to:
-  /// **'Daemon did not report file paths. Update the running hub via `fai daemon restart`.'**
+  /// **'Daemon did not report file paths. Update the running hub via `chain daemon restart`.'**
   String get doctorPathsEmpty;
 
   /// No description provided for @doctorOpenError.
@@ -3371,7 +3371,7 @@ abstract class AppLocalizations {
   /// No description provided for @doctorUpdateBody.
   ///
   /// In en, this message translates to:
-  /// **'Channel {channel} now offers {version}. Apply via the button — Studio shells out to `fai update apply --channel {channel}`.'**
+  /// **'Channel {channel} now offers {version}. Apply via the button — Studio shells out to `chain update apply --channel {channel}`.'**
   String doctorUpdateBody(String channel, String version);
 
   /// No description provided for @doctorUpdateUnreachable.
@@ -3467,7 +3467,7 @@ abstract class AppLocalizations {
   /// No description provided for @hubUnreachableHint.
   ///
   /// In en, this message translates to:
-  /// **'Start the hub with `fai serve`.'**
+  /// **'Start the hub with `chain serve`.'**
   String get hubUnreachableHint;
 
   /// No description provided for @languageEnglish.
@@ -4253,13 +4253,13 @@ abstract class AppLocalizations {
   /// No description provided for @addSourceHowItWorksBody.
   ///
   /// In en, this message translates to:
-  /// **'A module is a directory with a module.yaml + the WASM artifact. To share it: pack it (`fai pack <dir>`) and host the resulting `.fai` bundle anywhere (your own Forgejo / GitHub / S3). The hub installs by URL and verifies the signature against its trust store.\n\nDeveloping locally? Use the CLI — Studio cannot install from an unpacked directory (yet):'**
+  /// **'A module is a directory with a module.yaml + the WASM artifact. To share it: pack it (`chain pack <dir>`) and host the resulting `.fai` bundle anywhere (your own Forgejo / GitHub / S3). The hub installs by URL and verifies the signature against its trust store.\n\nDeveloping locally? Use the CLI — Studio cannot install from an unpacked directory (yet):'**
   String get addSourceHowItWorksBody;
 
   /// No description provided for @addSourceCliExample.
   ///
   /// In en, this message translates to:
-  /// **'fai install --link /path/to/module'**
+  /// **'chain install --link /path/to/module'**
   String get addSourceCliExample;
 
   /// No description provided for @addSourceInstallButton.
@@ -4337,7 +4337,7 @@ abstract class AppLocalizations {
   /// No description provided for @faiBinaryNotFoundHint.
   ///
   /// In en, this message translates to:
-  /// **'Install the F∆I platform, or point Studio at an existing `fai` binary.'**
+  /// **'Install the Ch∆In platform, or point Studio at an existing `fai` binary.'**
   String get faiBinaryNotFoundHint;
 
   /// No description provided for @faiBinaryLocateButton.
diff --git a/lib/l10n/app_localizations_de.dart b/lib/l10n/app_localizations_de.dart
index 7a4d453..3d971f7 100644
--- a/lib/l10n/app_localizations_de.dart
+++ b/lib/l10n/app_localizations_de.dart
@@ -9,13 +9,13 @@ class AppLocalizationsDe extends AppLocalizations {
   AppLocalizationsDe([String locale = 'de']) : super(locale);
 
   @override
-  String get appTitle => 'F∆I Studio';
+  String get appTitle => 'Ch∆In Studio';
 
   @override
   String get navWelcome => 'Willkommen';
 
   @override
-  String get welcomeHeroTitle => 'F∆I Platform';
+  String get welcomeHeroTitle => 'Ch∆In Platform';
 
   @override
   String get welcomeHeroSubtitle =>
@@ -196,7 +196,7 @@ class AppLocalizationsDe extends AppLocalizations {
 
   @override
   String get welcomeChecklistModuleHint =>
-      'Im Store ein Modul aus der Kategorie deiner Wahl installieren. Module sind sandboxed F∆I-Komponenten.';
+      'Im Store ein Modul aus der Kategorie deiner Wahl installieren. Module sind sandboxed Ch∆In-Komponenten.';
 
   @override
   String get welcomeChecklistFlow => 'Einen gespeicherten Flow starten';
@@ -775,7 +775,7 @@ class AppLocalizationsDe extends AppLocalizations {
   String get storeTodayBadge => 'HEUTE';
 
   @override
-  String get storeTodayDeck => 'Von der F∆I-Redaktion';
+  String get storeTodayDeck => 'Von der Ch∆In-Redaktion';
 
   @override
   String get storeTodayDismissTooltip => 'Für diese Sitzung ausblenden';
@@ -1125,7 +1125,7 @@ class AppLocalizationsDe extends AppLocalizations {
 
   @override
   String get modulesNoneHint =>
-      '`fai install <capability-name>` ausführen oder ~/.fai/modules/ prüfen.';
+      '`chain install <capability-name>` ausführen oder ~/.fai/modules/ prüfen.';
 
   @override
   String get modulesReloadTooltip => 'Aktualisieren';
@@ -1193,7 +1193,7 @@ class AppLocalizationsDe extends AppLocalizations {
 
   @override
   String get flowsNoneHint =>
-      'Flow speichern mit `fai admin flows save <name> <flow.yaml>`, dann taucht er hier auf.';
+      'Flow speichern mit `chain admin flows save <name> <flow.yaml>`, dann taucht er hier auf.';
 
   @override
   String flowsRunDialogTitle(String name) {
@@ -1497,7 +1497,7 @@ class AppLocalizationsDe extends AppLocalizations {
 
   @override
   String get welcomeChecklistNextModuleBody =>
-      'Mit `fai new module <name>` ein Rust+WASM-Scaffold erzeugen. Das module-sdk übernimmt die WIT-Plumbing; du schreibst nur ein typisiertes invoke.';
+      'Mit `chain new module <name>` ein Rust+WASM-Scaffold erzeugen. Das module-sdk übernimmt die WIT-Plumbing; du schreibst nur ein typisiertes invoke.';
 
   @override
   String get welcomeChecklistNextModuleButton => 'Doku lesen';
@@ -1635,7 +1635,7 @@ class AppLocalizationsDe extends AppLocalizations {
 
   @override
   String get errUnavailableHint =>
-      'Sicherstellen, dass `fai serve` (oder `fai daemon start`) läuft und der Daemon-Endpunkt zu Studios Einstellungen passt.';
+      'Sicherstellen, dass `chain serve` (oder `chain daemon start`) läuft und der Daemon-Endpunkt zu Studios Einstellungen passt.';
 
   @override
   String get errUnauthenticated => 'Authentifizierung erforderlich.';
@@ -1918,7 +1918,7 @@ class AppLocalizationsDe extends AppLocalizations {
 
   @override
   String get doctorDaemonControlHint =>
-      'Studio ruft das Platform-Binary auf — entspricht `fai daemon …`, sodass CLI und UI im Gleichschritt bleiben.';
+      'Studio ruft das Platform-Binary auf — entspricht `chain daemon …`, sodass CLI und UI im Gleichschritt bleiben.';
 
   @override
   String get doctorDaemonControlWorking => 'Wird ausgeführt…';
@@ -1943,7 +1943,7 @@ class AppLocalizationsDe extends AppLocalizations {
 
   @override
   String get doctorPathsEmpty =>
-      'Daemon hat keine Datei-Pfade gemeldet. Hub aktualisieren via `fai daemon restart`.';
+      'Daemon hat keine Datei-Pfade gemeldet. Hub aktualisieren via `chain daemon restart`.';
 
   @override
   String doctorOpenError(String detail) {
@@ -1957,7 +1957,7 @@ class AppLocalizationsDe extends AppLocalizations {
 
   @override
   String doctorUpdateBody(String channel, String version) {
-    return 'Kanal $channel bietet jetzt $version. Per Button anwenden — Studio ruft `fai update apply --channel $channel` auf.';
+    return 'Kanal $channel bietet jetzt $version. Per Button anwenden — Studio ruft `chain update apply --channel $channel` auf.';
   }
 
   @override
@@ -2015,7 +2015,7 @@ class AppLocalizationsDe extends AppLocalizations {
   String get hubUnreachable => 'Hub nicht erreichbar';
 
   @override
-  String get hubUnreachableHint => 'Hub starten mit `fai serve`.';
+  String get hubUnreachableHint => 'Hub starten mit `chain serve`.';
 
   @override
   String get languageEnglish => 'English';
@@ -2487,10 +2487,10 @@ class AppLocalizationsDe extends AppLocalizations {
 
   @override
   String get addSourceHowItWorksBody =>
-      'Ein Modul ist ein Verzeichnis mit module.yaml + WASM-Artefakt. Zum Teilen: `fai pack <verzeichnis>` baut ein `.fai`-Bundle, das du beliebig hosten kannst (eigene Forgejo / GitHub / S3). Der Hub installiert per URL und prüft die Signatur gegen seinen Trust-Store.\n\nLokal entwickeln? Nimm das CLI — Studio installiert (noch) nicht aus einem unverpackten Verzeichnis:';
+      'Ein Modul ist ein Verzeichnis mit module.yaml + WASM-Artefakt. Zum Teilen: `chain pack <verzeichnis>` baut ein `.fai`-Bundle, das du beliebig hosten kannst (eigene Forgejo / GitHub / S3). Der Hub installiert per URL und prüft die Signatur gegen seinen Trust-Store.\n\nLokal entwickeln? Nimm das CLI — Studio installiert (noch) nicht aus einem unverpackten Verzeichnis:';
 
   @override
-  String get addSourceCliExample => 'fai install --link /pfad/zum/modul';
+  String get addSourceCliExample => 'chain install --link /pfad/zum/modul';
 
   @override
   String get addSourceInstallButton => 'Installieren';
@@ -2540,7 +2540,7 @@ class AppLocalizationsDe extends AppLocalizations {
 
   @override
   String get faiBinaryNotFoundHint =>
-      'Installiere die F∆I-Plattform oder verweise Studio auf eine vorhandene `fai`-Datei.';
+      'Installiere die Ch∆In-Plattform oder verweise Studio auf eine vorhandene `fai`-Datei.';
 
   @override
   String get faiBinaryLocateButton => '`fai`-Programm suchen …';
diff --git a/lib/l10n/app_localizations_en.dart b/lib/l10n/app_localizations_en.dart
index f105d4b..7b9d408 100644
--- a/lib/l10n/app_localizations_en.dart
+++ b/lib/l10n/app_localizations_en.dart
@@ -9,13 +9,13 @@ class AppLocalizationsEn extends AppLocalizations {
   AppLocalizationsEn([String locale = 'en']) : super(locale);
 
   @override
-  String get appTitle => 'F∆I Studio';
+  String get appTitle => 'Ch∆In Studio';
 
   @override
   String get navWelcome => 'Welcome';
 
   @override
-  String get welcomeHeroTitle => 'F∆I Platform';
+  String get welcomeHeroTitle => 'Ch∆In Platform';
 
   @override
   String get welcomeHeroSubtitle =>
@@ -195,7 +195,7 @@ class AppLocalizationsEn extends AppLocalizations {
 
   @override
   String get welcomeChecklistModuleHint =>
-      'Install a module from the Store — pick whichever category fits your work. Modules are sandboxed F∆I components.';
+      'Install a module from the Store — pick whichever category fits your work. Modules are sandboxed Ch∆In components.';
 
   @override
   String get welcomeChecklistFlow => 'Run a saved flow';
@@ -793,7 +793,7 @@ class AppLocalizationsEn extends AppLocalizations {
   String get storeTodayBadge => 'TODAY';
 
   @override
-  String get storeTodayDeck => 'From the F∆I editor';
+  String get storeTodayDeck => 'From the Ch∆In editor';
 
   @override
   String get storeTodayDismissTooltip => 'Hide for this session';
@@ -1140,7 +1140,7 @@ class AppLocalizationsEn extends AppLocalizations {
 
   @override
   String get modulesNoneHint =>
-      'Run `fai install <capability-name>` or check ~/.fai/modules/.';
+      'Run `chain install <capability-name>` or check ~/.fai/modules/.';
 
   @override
   String get modulesReloadTooltip => 'Reload';
@@ -1208,7 +1208,7 @@ class AppLocalizationsEn extends AppLocalizations {
 
   @override
   String get flowsNoneHint =>
-      'Save a flow with `fai admin flows save <name> <flow.yaml>` and it shows up here.';
+      'Save a flow with `chain admin flows save <name> <flow.yaml>` and it shows up here.';
 
   @override
   String flowsRunDialogTitle(String name) {
@@ -1508,7 +1508,7 @@ class AppLocalizationsEn extends AppLocalizations {
 
   @override
   String get welcomeChecklistNextModuleBody =>
-      'Generate a Rust+WASM scaffold with `fai new module <name>`. The module-sdk handles the WIT plumbing; you write a typed invoke.';
+      'Generate a Rust+WASM scaffold with `chain new module <name>`. The module-sdk handles the WIT plumbing; you write a typed invoke.';
 
   @override
   String get welcomeChecklistNextModuleButton => 'Read the docs';
@@ -1645,7 +1645,7 @@ class AppLocalizationsEn extends AppLocalizations {
 
   @override
   String get errUnavailableHint =>
-      'Make sure `fai serve` (or `fai daemon start`) is running and the daemon endpoint matches Studio\'s settings.';
+      'Make sure `chain serve` (or `chain daemon start`) is running and the daemon endpoint matches Studio\'s settings.';
 
   @override
   String get errUnauthenticated => 'Authentication required.';
@@ -1927,7 +1927,7 @@ class AppLocalizationsEn extends AppLocalizations {
 
   @override
   String get doctorDaemonControlHint =>
-      'Studio shells out to the platform binary — mirrors `fai daemon …` exactly so the CLI and UI stay in lockstep.';
+      'Studio shells out to the platform binary — mirrors `chain daemon …` exactly so the CLI and UI stay in lockstep.';
 
   @override
   String get doctorDaemonControlWorking => 'Working…';
@@ -1952,7 +1952,7 @@ class AppLocalizationsEn extends AppLocalizations {
 
   @override
   String get doctorPathsEmpty =>
-      'Daemon did not report file paths. Update the running hub via `fai daemon restart`.';
+      'Daemon did not report file paths. Update the running hub via `chain daemon restart`.';
 
   @override
   String doctorOpenError(String detail) {
@@ -1966,7 +1966,7 @@ class AppLocalizationsEn extends AppLocalizations {
 
   @override
   String doctorUpdateBody(String channel, String version) {
-    return 'Channel $channel now offers $version. Apply via the button — Studio shells out to `fai update apply --channel $channel`.';
+    return 'Channel $channel now offers $version. Apply via the button — Studio shells out to `chain update apply --channel $channel`.';
   }
 
   @override
@@ -2022,7 +2022,7 @@ class AppLocalizationsEn extends AppLocalizations {
   String get hubUnreachable => 'Hub unreachable';
 
   @override
-  String get hubUnreachableHint => 'Start the hub with `fai serve`.';
+  String get hubUnreachableHint => 'Start the hub with `chain serve`.';
 
   @override
   String get languageEnglish => 'English';
@@ -2491,10 +2491,10 @@ class AppLocalizationsEn extends AppLocalizations {
 
   @override
   String get addSourceHowItWorksBody =>
-      'A module is a directory with a module.yaml + the WASM artifact. To share it: pack it (`fai pack <dir>`) and host the resulting `.fai` bundle anywhere (your own Forgejo / GitHub / S3). The hub installs by URL and verifies the signature against its trust store.\n\nDeveloping locally? Use the CLI — Studio cannot install from an unpacked directory (yet):';
+      'A module is a directory with a module.yaml + the WASM artifact. To share it: pack it (`chain pack <dir>`) and host the resulting `.fai` bundle anywhere (your own Forgejo / GitHub / S3). The hub installs by URL and verifies the signature against its trust store.\n\nDeveloping locally? Use the CLI — Studio cannot install from an unpacked directory (yet):';
 
   @override
-  String get addSourceCliExample => 'fai install --link /path/to/module';
+  String get addSourceCliExample => 'chain install --link /path/to/module';
 
   @override
   String get addSourceInstallButton => 'Install';
@@ -2543,7 +2543,7 @@ class AppLocalizationsEn extends AppLocalizations {
 
   @override
   String get faiBinaryNotFoundHint =>
-      'Install the F∆I platform, or point Studio at an existing `fai` binary.';
+      'Install the Ch∆In platform, or point Studio at an existing `fai` binary.';
 
   @override
   String get faiBinaryLocateButton => 'Locate `fai` binary…';
diff --git a/lib/main.dart b/lib/main.dart
index 0d10ff7..021f3be 100644
--- a/lib/main.dart
+++ b/lib/main.dart
@@ -1,4 +1,4 @@
-// F∆I Studio — desktop GUI for the F∆I hub.
+// Ch∆In Studio — desktop GUI for the Ch∆In hub.
 //
 // Visual language: warm minimalism / deep tech with soul.
 // Tokens in lib/theme/, primitives in lib/widgets/.
@@ -215,7 +215,7 @@ class StudioAppState extends State<StudioApp> {
                 builder: (context, snap) {
                   final p = snap.data ?? (light: null, dark: null);
                   return MaterialApp(
-                    title: 'F∆I Studio',
+                    title: 'Ch∆In Studio',
                     debugShowCheckedModeBanner: false,
                     theme: p.light ?? FaiTheme.light(),
                     darkTheme: p.dark ?? FaiTheme.dark(),
@@ -1072,7 +1072,7 @@ class _BrandLabel extends StatelessWidget {
       crossAxisAlignment: CrossAxisAlignment.start,
       children: [
         const Text(
-          'F∆I Studio',
+          'Ch∆In Studio',
           style: TextStyle(fontSize: 16, fontWeight: FontWeight.w600),
           maxLines: 1,
           overflow: TextOverflow.ellipsis,
diff --git a/lib/pages/audit.dart b/lib/pages/audit.dart
index ebef8bf..b292932 100644
--- a/lib/pages/audit.dart
+++ b/lib/pages/audit.dart
@@ -526,7 +526,7 @@ class _EventDetailDialogState extends State<_EventDetailDialog> {
   String _buildPrompt(AuditEvent e, String mode) {
     // Privacy: redacted = no detail JSON, full = include it.
     final buf = StringBuffer()
-      ..writeln('A F∆I Platform audit event was logged. Explain what')
+      ..writeln('A Ch∆In Platform audit event was logged. Explain what')
       ..writeln('happened in plain language and suggest one concrete')
       ..writeln('fix the operator can apply now.')
       ..writeln()
diff --git a/lib/pages/doctor.dart b/lib/pages/doctor.dart
index 4b3fe0a..c42f7bd 100644
--- a/lib/pages/doctor.dart
+++ b/lib/pages/doctor.dart
@@ -481,7 +481,7 @@ class _PathRow extends StatelessWidget {
 
 /// Daemon control affordances: Restart, Apply update, Stop.
 /// Each shells out to the `fai` binary (resolved via PATH or
-/// `~/.fai/bin/fai`). Studio is the GUI shell; the binary owns
+/// `~/.fai/bin/chain`). Studio is the GUI shell; the binary owns
 /// the supervisor logic so the daemon and CLI stay in lockstep.
 class _DaemonActionsCard extends StatefulWidget {
   @override
diff --git a/lib/pages/store.dart b/lib/pages/store.dart
index 05a85ab..6b235ed 100644
--- a/lib/pages/store.dart
+++ b/lib/pages/store.dart
@@ -1405,7 +1405,7 @@ String _buildAiSearchPrompt(
   String locale,
 ) {
   final lang = locale == 'de' ? 'German' : 'English';
-  return '''You are the F∆I Store assistant. The operator just asked, in $lang:
+  return '''You are the Ch∆In Store assistant. The operator just asked, in $lang:
 
 "$query"
 
@@ -3009,9 +3009,9 @@ const List<TodayStoryData> _kFallbackTodayStories = <TodayStoryData>[
     titleEn: 'Plug in any MCP server',
     titleDe: 'Jeden MCP-Server einbinden',
     bodyEn:
-        'F∆I speaks the Model Context Protocol out of the box. Add a public server (DeepWiki, Semgrep) or a private one — its tools show up in this grid next to the built-in modules. Same install button, same audit trail.',
+        'Ch∆In speaks the Model Context Protocol out of the box. Add a public server (DeepWiki, Semgrep) or a private one — its tools show up in this grid next to the built-in modules. Same install button, same audit trail.',
     bodyDe:
-        'F∆I spricht das Model Context Protocol von Haus aus. Einen öffentlichen Server (DeepWiki, Semgrep) oder einen eigenen hinzufügen — seine Tools tauchen in diesem Grid neben den eingebauten Modulen auf. Gleicher Install-Button, gleiche Audit-Spur.',
+        'Ch∆In spricht das Model Context Protocol von Haus aus. Einen öffentlichen Server (DeepWiki, Semgrep) oder einen eigenen hinzufügen — seine Tools tauchen in diesem Grid neben den eingebauten Modulen auf. Gleicher Install-Button, gleiche Audit-Spur.',
     ctaLabelEn: 'Browse suggested sources',
     ctaLabelDe: 'Empfohlene Quellen ansehen',
     icon: Icons.hub_outlined,
@@ -3053,9 +3053,9 @@ const List<TodayStoryData> _kFallbackTodayStories = <TodayStoryData>[
     titleEn: 'Extract, anonymise, translate, summarise',
     titleDe: 'Extrahieren, anonymisieren, übersetzen, zusammenfassen',
     bodyEn:
-        'The text-processing bundle is F∆I\'s document-analysis backbone. PDF and DOCX in, plain text out. Then anonymise PII, translate, or summarise — every step audit-grade, every Ollama call recorded with model digest.',
+        'The text-processing bundle is Ch∆In\'s document-analysis backbone. PDF and DOCX in, plain text out. Then anonymise PII, translate, or summarise — every step audit-grade, every Ollama call recorded with model digest.',
     bodyDe:
-        'Das Text-Processing-Bündel ist F∆Is Dokumentenanalyse-Rückgrat. PDF und DOCX rein, Klartext raus. Dann PII anonymisieren, übersetzen oder zusammenfassen — jeder Schritt audit-tauglich, jeder Ollama-Aufruf mit Modell-Digest protokolliert.',
+        'Das Text-Processing-Bündel ist Ch∆Ins Dokumentenanalyse-Rückgrat. PDF und DOCX rein, Klartext raus. Dann PII anonymisieren, übersetzen oder zusammenfassen — jeder Schritt audit-tauglich, jeder Ollama-Aufruf mit Modell-Digest protokolliert.',
     ctaLabelEn: 'Show text modules',
     ctaLabelDe: 'Text-Module zeigen',
     icon: Icons.article_outlined,
@@ -3068,9 +3068,9 @@ const List<TodayStoryData> _kFallbackTodayStories = <TodayStoryData>[
     titleEn: 'Every module declares its permissions',
     titleDe: 'Jedes Modul deklariert seine Berechtigungen',
     bodyEn:
-        'F∆I modules are WASM components. They run in a sandbox with no ambient authority — every filesystem path, every network host, every env var has to be listed in module.yaml. The hub enforces them. No declaration, no access.',
+        'Ch∆In modules are WASM components. They run in a sandbox with no ambient authority — every filesystem path, every network host, every env var has to be listed in module.yaml. The hub enforces them. No declaration, no access.',
     bodyDe:
-        'F∆I-Module sind WASM-Komponenten. Sie laufen in einer Sandbox ohne Ambient-Authority — jeder Dateipfad, jeder Netzwerk-Host, jede Env-Var muss in module.yaml stehen. Der Hub setzt es durch. Keine Deklaration, kein Zugriff.',
+        'Ch∆In-Module sind WASM-Komponenten. Sie laufen in einer Sandbox ohne Ambient-Authority — jeder Dateipfad, jeder Netzwerk-Host, jede Env-Var muss in module.yaml stehen. Der Hub setzt es durch. Keine Deklaration, kein Zugriff.',
     ctaLabelEn: 'Review permissions',
     ctaLabelDe: 'Berechtigungen prüfen',
     icon: Icons.shield_outlined,
@@ -3093,12 +3093,12 @@ const List<TodayStoryData> _kFallbackTodayStories = <TodayStoryData>[
   TodayStoryData(
     badgeEn: 'TEST FIRST',
     badgeDe: 'ZUERST TESTEN',
-    titleEn: 'fai doctor — diagnose before you ship',
-    titleDe: 'fai doctor — diagnostizieren bevor ausgerollt wird',
+    titleEn: 'chain doctor — diagnose before you ship',
+    titleDe: 'chain doctor — diagnostizieren bevor ausgerollt wird',
     bodyEn:
-        'Before installing a module on a production hub, run `fai doctor` in the CLI. It validates manifest, signatures, declared permissions against the operator policy ceiling, and reports anything the hub would reject — no surprises at install time.',
+        'Before installing a module on a production hub, run `chain doctor` in the CLI. It validates manifest, signatures, declared permissions against the operator policy ceiling, and reports anything the hub would reject — no surprises at install time.',
     bodyDe:
-        'Bevor ein Modul auf einem Produktions-Hub installiert wird, in der CLI `fai doctor` laufen lassen. Validiert Manifest, Signaturen und deklarierte Berechtigungen gegen die Operator-Policy-Decke — keine Überraschungen beim Install.',
+        'Bevor ein Modul auf einem Produktions-Hub installiert wird, in der CLI `chain doctor` laufen lassen. Validiert Manifest, Signaturen und deklarierte Berechtigungen gegen die Operator-Policy-Decke — keine Überraschungen beim Install.',
     ctaLabelEn: '',
     ctaLabelDe: '',
     icon: Icons.health_and_safety_outlined,
diff --git a/lib/pages/welcome.dart b/lib/pages/welcome.dart
index 235893c..ac51686 100644
--- a/lib/pages/welcome.dart
+++ b/lib/pages/welcome.dart
@@ -1,5 +1,5 @@
 // Welcome — first surface a new operator sees, default sidebar
-// destination on launch. Pure introduction: what F∆I is, the
+// destination on launch. Pure introduction: what Ch∆In is, the
 // three concepts, the trust posture. No live data, no
 // federation chrome — that's the Store's role.
 //
@@ -1140,7 +1140,7 @@ class _DocReaderError {
       'Tried: ${attempted.join(", ")}\n'
       'Underlying: $underlying\n'
       'This typically means the Studio binary on disk is from\n'
-      'before the doc bundle changed. Rebuild Studio (fai studio\n'
+      'before the doc bundle changed. Rebuild Studio (chain studio\n'
       'or the build pipeline) or open the Forgejo copy in browser.';
 }
 
diff --git a/lib/theme/tokens.dart b/lib/theme/tokens.dart
index dbbc84b..b583607 100644
--- a/lib/theme/tokens.dart
+++ b/lib/theme/tokens.dart
@@ -1,11 +1,11 @@
-// Design tokens for F∆I Studio.
+// Design tokens for Ch∆In Studio.
 //
 // One file, semantic names, no magic numbers in the rest of the
 // codebase. Both light and dark modes derive from these tokens.
 
 import 'package:flutter/material.dart';
 
-/// Colour palette. Single strong accent (F∆I Cyan) plus neutral
+/// Colour palette. Single strong accent (Ch∆In Cyan) plus neutral
 /// greys. Status colours stay restrained — no candy palette.
 class FaiColors {
   FaiColors._();
diff --git a/lib/widgets/fai_card.dart b/lib/widgets/fai_card.dart
index e6449c3..7eb6cc3 100644
--- a/lib/widgets/fai_card.dart
+++ b/lib/widgets/fai_card.dart
@@ -1,5 +1,5 @@
 // FaiCard — flat card with subtle accent gradient on the top
-// border. Replaces Material's default Card for the F∆I look.
+// border. Replaces Material's default Card for the Ch∆In look.
 
 import 'package:flutter/material.dart';
 
diff --git a/lib/widgets/fai_delta_mark.dart b/lib/widgets/fai_delta_mark.dart
index 49d19ee..025988c 100644
--- a/lib/widgets/fai_delta_mark.dart
+++ b/lib/widgets/fai_delta_mark.dart
@@ -1,4 +1,4 @@
-// FaiDeltaMark — the F∆I signature element. A precise triangle
+// FaiDeltaMark — the Ch∆In signature element. A precise triangle
 // (∆) drawn from primitives, not a font glyph. Three states:
 //
 // - idle: static, accent colour, soft glow
diff --git a/lib/widgets/fai_empty_state.dart b/lib/widgets/fai_empty_state.dart
index cf393b9..979afd9 100644
--- a/lib/widgets/fai_empty_state.dart
+++ b/lib/widgets/fai_empty_state.dart
@@ -2,7 +2,7 @@
 // Replaces "(no data)" strings with one tone, one icon, one tip.
 //
 // The blank surface is where an app most easily feels unfinished,
-// so this state is deliberately *designed*: the F∆I delta (∆)
+// so this state is deliberately *designed*: the Ch∆In delta (∆)
 // sits as a soft watermark behind the icon badge, the badge
 // carries a whisper of elevation, and the copy breathes. The
 // result reads "nothing here yet, on purpose" rather than
@@ -48,7 +48,7 @@ class FaiEmptyState extends StatelessWidget {
               // Brand hero: an oversized, low-opacity ∆ watermark
               // anchors the composition while the contextual icon
               // badge sits crisply on top — so every empty surface
-              // still carries the F∆I signature, never a bare icon.
+              // still carries the Ch∆In signature, never a bare icon.
               SizedBox(
                 width: 112,
                 height: 112,
diff --git a/lib/widgets/fai_settings_dialog.dart b/lib/widgets/fai_settings_dialog.dart
index 8510e17..b067622 100644
--- a/lib/widgets/fai_settings_dialog.dart
+++ b/lib/widgets/fai_settings_dialog.dart
@@ -1013,7 +1013,7 @@ class McpClientDraft {
 /// MCP-clients panel — shows every configured server with its
 /// last-discovery health, plus Add / Remove / Refresh actions.
 /// Configure a server here, the store gains synthetic
-/// capabilities for every advertised tool. Mirrors `fai mcp …`
+/// capabilities for every advertised tool. Mirrors `chain mcp …`
 /// on the CLI.
 class _McpClientsPanel extends StatelessWidget {
   final List<McpClientInfo> clients;
@@ -1669,7 +1669,7 @@ class _ThemePluginPanel extends StatelessWidget {
 }
 
 /// Hub maintenance panel — currently one action: reset operator
-/// state via `fai reset --yes`. Lives at the bottom of Settings
+/// state via `chain reset --yes`. Lives at the bottom of Settings
 /// so the everyday config controls aren't crowded by a destructive
 /// button. The reset itself is gated by an interactive confirm
 /// dialog before the CLI is invoked.
diff --git a/lib/widgets/fai_system_ai_editor.dart b/lib/widgets/fai_system_ai_editor.dart
index 77c3589..54881f7 100644
--- a/lib/widgets/fai_system_ai_editor.dart
+++ b/lib/widgets/fai_system_ai_editor.dart
@@ -820,7 +820,7 @@ class _ModelPicker extends StatelessWidget {
 /// round-trip; works for Ollama tags (`gemma3:4b`), OpenAI names
 /// (`gpt-4o-mini`), Anthropic-style (`claude-haiku-4-5`).
 enum _Suitability {
-  recommended, // tested with F∆I System AI
+  recommended, // tested with Ch∆In System AI
   balanced, // 4-8B params or known-good cloud model
   small, // <4B params; quality may be insufficient
   large, // 9-15B; slower but ok
diff --git a/lib/widgets/widgets.dart b/lib/widgets/widgets.dart
index 6f294c0..adea76b 100644
--- a/lib/widgets/widgets.dart
+++ b/lib/widgets/widgets.dart
@@ -1,4 +1,4 @@
-// Barrel file for the F∆I Studio widget library.
+// Barrel file for the Ch∆In Studio widget library.
 //
 // Pages should `import '../widgets/widgets.dart';` and use the
 // primitives directly — no Material `Card` / generic `Container`
diff --git a/pubspec.yaml b/pubspec.yaml
index 4a794ad..b941b3e 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,5 +1,5 @@
 name: fai_studio
-description: "F∆I Studio — desktop GUI for the F∆I hub"
+description: "Ch∆In Studio — desktop GUI for the Ch∆In hub"
 publish_to: 'none'
 version: 0.70.0
 
diff --git a/test/integration/README.md b/test/integration/README.md
index bf45b96..edbed8b 100644
--- a/test/integration/README.md
+++ b/test/integration/README.md
@@ -1,6 +1,6 @@
 # Integration tests
 
-These tests spin up a real `fai serve` subprocess against a
+These tests spin up a real `chain serve` subprocess against a
 fresh temp dir and exercise Studio's Hub-facing data layer
 against it. They cover the "kind of regression that survives
 unit tests because the system-shape only manifests across the
@@ -48,15 +48,15 @@ cargo build --release --bin fai
 
 ### First-time-start gotcha
 
-A cold `fai serve` spends its first ~30s building the
+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 `fai serve` once by hand
+hub takes longer the first time, run `chain serve` once by hand
 against any temp `FAI_DATA_DIR` to warm the per-user cargo /
 SBOM caches:
 
 ```bash
-FAI_DATA_DIR=/tmp/fai_warmup fai serve --bind 127.0.0.1:0
+FAI_DATA_DIR=/tmp/fai_warmup chain serve --bind 127.0.0.1:0
 # wait for "hub started", Ctrl-C
 ```
 
diff --git a/tools/today/README.md b/tools/today/README.md
index faa50fe..a25ac3e 100644
--- a/tools/today/README.md
+++ b/tools/today/README.md
@@ -62,7 +62,7 @@ or `generate`; the script auto-detects from the URL path.
 ## Trust model
 
 - Reads only `git log`, `git diff`, and the bundled `seed.yaml` of
-  installed F∆I monorepos. Never your audit log without explicit op-in.
+  installed Ch∆In monorepos. Never your audit log without explicit op-in.
 - Calls only the System-AI you've already configured for Studio. The same
   privacy mode you set there applies here.
 - Writes only into `~/.fai/today/`. Nothing in `~/.fai/data/` or
diff --git a/tools/today/prompt.template.md b/tools/today/prompt.template.md
index a1bab29..529ad74 100644
--- a/tools/today/prompt.template.md
+++ b/tools/today/prompt.template.md
@@ -1,11 +1,11 @@
-You are the Today-tab editor for the F∆I Platform Studio store.
+You are the Today-tab editor for the Ch∆In Platform Studio store.
 Your job is to draft ONE editorial story per run that the platform's
 solo developer (Stefan Flemming) will review and either accept or
 discard.
 
 ## Project identity (do not deviate)
 
-F∆I Platform is a deterministic workflow engine for AI-assisted
+Ch∆In Platform is a deterministic workflow engine for AI-assisted
 document processing in regulated environments. It runs WASM modules
 inside YAML flows, with sandbox-secure capability discovery.
 
@@ -68,7 +68,7 @@ cta_label_de: <≤5 words. Required when cta != none.>
 
 ## Signal input
 
-Below is the "what happened in F∆I in the last 24 hours" summary —
+Below is the "what happened in Ch∆In in the last 24 hours" summary —
 git log entries, store-index changes, audit-log highlights. Pick the
 ONE most operator-relevant thread and tell its story. If nothing
 notable happened, surface a longer-arc theme (recent week's progress,