fix(doctor): honest module count, temp-path audit warning, connection line

Three doctor-page findings from the usertest panel:

- Module tile no longer counts the hub's built-in 'system'
  pseudo-module — a fresh hub shows 0 modules, matching the
  welcome checklist's definition of an install. Counting is a
  top-level function with unit tests.
- When the audit DB lives in an OS-cleanable temp directory
  (/var/folders, /tmp, Windows Temp), the daemon-files panel
  says so instead of presenting the state as healthy. The
  classifier is a top-level function with unit tests.
- The daemon card states who-talks-to-whom-how in one line:
  endpoint, transport security (TLS / unencrypted-local /
  unencrypted), and whether a bearer token is attached (length
  only) — the auditor's baseline the green dot cannot answer.

Also syncs pubspec.yaml (0.70.0 -> 0.72.0) with kStudioVersion,
which had drifted to 0.71.0 while pubspec stayed behind.

Signed-off-by: flemming-it <stefan.a.flemming@googlemail.com>

lib/data/about_info.dart

@@ -4,7 +4,7 @@
 
 /// Studio's own build version. Bump on every UI release so the
 /// running app self-identifies.
-const String kStudioVersion = '0.71.0';
+const String kStudioVersion = '0.72.0';
 
 const String kProductName = 'Ch∆In Studio';
 const String kVendorName = 'Flemming.AI (F∆I)';

lib/data/hub.dart

@@ -1238,7 +1238,7 @@ class HubService {
     final paths = results[5] as DaemonPathsResponse;
 
     // Module count = distinct module_name across capabilities.
-    final moduleNames = <String>{for (final c in caps) c.moduleName};
+    final moduleNames = installedModuleNames(caps);
 
     // Per-source-kind breakdown (0.12+). Pre-0.12 hubs return
     // empty `source_kind` strings — group those under `kind`
@@ -1306,6 +1306,17 @@ class UpdateStatus {
   });
 }
 
+/// Distinct installed-module names behind a capability list.
+/// Excludes the hub's built-in `system` pseudo-module
+/// (`builtin_capabilities` reports `module_name: "system"`):
+/// the welcome checklist already treats `system.*` as "built
+/// in, not an install", and the doctor tile must count the
+/// same way — a fresh hub shows 0 modules, not 1.
+Set<String> installedModuleNames(Iterable<CapabilityEntry> caps) => {
+  for (final c in caps)
+    if (c.moduleName != 'system') c.moduleName,
+};
+
 class DoctorSnapshot {
   final int moduleCount;
   final int capabilityCount;

lib/l10n/app_de.arb

@@ -1267,6 +1267,25 @@
   "doctorPillStopped": "gestoppt",
   "doctorDaemonControlHint": "Studio ruft das Platform-Binary auf — entspricht chain daemon …, sodass CLI und UI im Gleichschritt bleiben.",
   "doctorDaemonControlWorking": "Wird ausgeführt…",
+  "doctorConnLine": "Verbindung: {endpoint} · {transport} · {auth}",
+  "@doctorConnLine": {
+    "placeholders": {
+      "endpoint": {"type": "String"},
+      "transport": {"type": "String"},
+      "auth": {"type": "String"}
+    }
+  },
+  "doctorConnTls": "TLS-verschlüsselt",
+  "doctorConnPlainLocal": "unverschlüsselt (bleibt auf diesem Rechner)",
+  "doctorConnPlainRemote": "unverschlüsselt",
+  "doctorConnToken": "Token gesetzt ({count} Zeichen)",
+  "@doctorConnToken": {
+    "placeholders": {
+      "count": {"type": "int"}
+    }
+  },
+  "doctorConnAnonymous": "ohne Token (anonym)",
+  "doctorDbVolatileWarning": "Die Audit-Datenbank liegt in einem temporären Ordner, den das Betriebssystem jederzeit aufräumen kann. Für belastbare Nachweise gehört das Datenverzeichnis des Hubs an einen dauerhaften Ort.",
   "doctorPathLog": "Log",
   "doctorPathConfig": "Konfig",
   "doctorPathDb": "Audit-DB",

lib/l10n/app_en.arb

@@ -1291,6 +1291,25 @@
   "doctorPillStopped": "stopped",
   "doctorDaemonControlHint": "Studio shells out to the platform binary — mirrors chain daemon … exactly so the CLI and UI stay in lockstep.",
   "doctorDaemonControlWorking": "Working…",
+  "doctorConnLine": "Connection: {endpoint} · {transport} · {auth}",
+  "@doctorConnLine": {
+    "placeholders": {
+      "endpoint": {"type": "String"},
+      "transport": {"type": "String"},
+      "auth": {"type": "String"}
+    }
+  },
+  "doctorConnTls": "TLS-encrypted",
+  "doctorConnPlainLocal": "unencrypted (stays on this machine)",
+  "doctorConnPlainRemote": "unencrypted",
+  "doctorConnToken": "token configured ({count} characters)",
+  "@doctorConnToken": {
+    "placeholders": {
+      "count": {"type": "int"}
+    }
+  },
+  "doctorConnAnonymous": "no token (anonymous)",
+  "doctorDbVolatileWarning": "The audit database is stored in a temporary folder the operating system may clean up at any time. For real evidence, move the hub's data directory to a permanent location.",
   "doctorPathLog": "Log",
   "doctorPathConfig": "Config",
   "doctorPathDb": "Audit DB",

lib/l10n/app_localizations.dart

@@ -3836,6 +3836,48 @@ abstract class AppLocalizations {
   /// **'Working…'**
   String get doctorDaemonControlWorking;
 
+  /// No description provided for @doctorConnLine.
+  ///
+  /// In en, this message translates to:
+  /// **'Connection: {endpoint} · {transport} · {auth}'**
+  String doctorConnLine(String endpoint, String transport, String auth);
+
+  /// No description provided for @doctorConnTls.
+  ///
+  /// In en, this message translates to:
+  /// **'TLS-encrypted'**
+  String get doctorConnTls;
+
+  /// No description provided for @doctorConnPlainLocal.
+  ///
+  /// In en, this message translates to:
+  /// **'unencrypted (stays on this machine)'**
+  String get doctorConnPlainLocal;
+
+  /// No description provided for @doctorConnPlainRemote.
+  ///
+  /// In en, this message translates to:
+  /// **'unencrypted'**
+  String get doctorConnPlainRemote;
+
+  /// No description provided for @doctorConnToken.
+  ///
+  /// In en, this message translates to:
+  /// **'token configured ({count} characters)'**
+  String doctorConnToken(int count);
+
+  /// No description provided for @doctorConnAnonymous.
+  ///
+  /// In en, this message translates to:
+  /// **'no token (anonymous)'**
+  String get doctorConnAnonymous;
+
+  /// No description provided for @doctorDbVolatileWarning.
+  ///
+  /// In en, this message translates to:
+  /// **'The audit database is stored in a temporary folder the operating system may clean up at any time. For real evidence, move the hub\'s data directory to a permanent location.'**
+  String get doctorDbVolatileWarning;
+
   /// No description provided for @doctorPathLog.
   ///
   /// In en, this message translates to:

lib/l10n/app_localizations_de.dart

@@ -2255,6 +2255,33 @@ class AppLocalizationsDe extends AppLocalizations {
   @override
   String get doctorDaemonControlWorking => 'Wird ausgeführt…';
 
+  @override
+  String doctorConnLine(String endpoint, String transport, String auth) {
+    return 'Verbindung: $endpoint · $transport · $auth';
+  }
+
+  @override
+  String get doctorConnTls => 'TLS-verschlüsselt';
+
+  @override
+  String get doctorConnPlainLocal =>
+      'unverschlüsselt (bleibt auf diesem Rechner)';
+
+  @override
+  String get doctorConnPlainRemote => 'unverschlüsselt';
+
+  @override
+  String doctorConnToken(int count) {
+    return 'Token gesetzt ($count Zeichen)';
+  }
+
+  @override
+  String get doctorConnAnonymous => 'ohne Token (anonym)';
+
+  @override
+  String get doctorDbVolatileWarning =>
+      'Die Audit-Datenbank liegt in einem temporären Ordner, den das Betriebssystem jederzeit aufräumen kann. Für belastbare Nachweise gehört das Datenverzeichnis des Hubs an einen dauerhaften Ort.';
+
   @override
   String get doctorPathLog => 'Log';
 

lib/l10n/app_localizations_en.dart

@@ -2261,6 +2261,32 @@ class AppLocalizationsEn extends AppLocalizations {
   @override
   String get doctorDaemonControlWorking => 'Working…';
 
+  @override
+  String doctorConnLine(String endpoint, String transport, String auth) {
+    return 'Connection: $endpoint · $transport · $auth';
+  }
+
+  @override
+  String get doctorConnTls => 'TLS-encrypted';
+
+  @override
+  String get doctorConnPlainLocal => 'unencrypted (stays on this machine)';
+
+  @override
+  String get doctorConnPlainRemote => 'unencrypted';
+
+  @override
+  String doctorConnToken(int count) {
+    return 'token configured ($count characters)';
+  }
+
+  @override
+  String get doctorConnAnonymous => 'no token (anonymous)';
+
+  @override
+  String get doctorDbVolatileWarning =>
+      'The audit database is stored in a temporary folder the operating system may clean up at any time. For real evidence, move the hub\'s data directory to a permanent location.';
+
   @override
   String get doctorPathLog => 'Log';
 

lib/pages/doctor.dart

@@ -4,6 +4,7 @@ import 'package:flutter/services.dart';
 import '../data/error_presentation.dart';
 import '../data/chain_log.dart';
 import '../data/hub.dart';
+import '../data/hub_auth_token.dart';
 import '../data/system_actions.dart';
 import '../l10n/app_localizations.dart';
 import '../theme/theme.dart';
@@ -334,6 +335,24 @@ class _EventLogPanel extends StatelessWidget {
   }
 }
 
+/// True when [path] points into an OS-managed temporary
+/// directory (macOS `/var/folders`, Unix `/tmp`, the Windows
+/// user/system temp folders) — locations the OS may clean up
+/// at any time. The doctor page warns when the audit DB lives
+/// in one: an evidence log the OS can silently delete is not
+/// evidence. Top-level so the unit test can exercise the
+/// classification directly.
+bool isVolatilePath(String path) {
+  if (path.isEmpty) return false;
+  final p = path.toLowerCase().replaceAll('\\', '/');
+  return p.startsWith('/tmp/') ||
+      p.startsWith('/private/tmp/') ||
+      p.startsWith('/var/folders/') ||
+      p.startsWith('/private/var/folders/') ||
+      p.contains('/appdata/local/temp/') ||
+      p.contains('/windows/temp/');
+}
+
 /// Lists the daemon's filesystem paths with one "Open" button
 /// per row. Windows operators who never touch a shell still
 /// need a way to inspect the audit DB or edit the operator
@@ -374,10 +393,33 @@ class _DaemonPathsPanel extends StatelessWidget {
       );
     }
 
+    final theme = Theme.of(context);
     return ChainCard(
       child: Column(
         crossAxisAlignment: CrossAxisAlignment.start,
         children: [
+          if (isVolatilePath(paths.dbPath)) ...[
+            Row(
+              crossAxisAlignment: CrossAxisAlignment.start,
+              children: [
+                const Icon(
+                  Icons.warning_amber_outlined,
+                  size: 16,
+                  color: ChainColors.warning,
+                ),
+                const SizedBox(width: ChainSpace.sm),
+                Expanded(
+                  child: Text(
+                    l.doctorDbVolatileWarning,
+                    style: theme.textTheme.bodySmall?.copyWith(
+                      color: theme.colorScheme.onSurfaceVariant,
+                    ),
+                  ),
+                ),
+              ],
+            ),
+            const SizedBox(height: ChainSpace.sm),
+          ],
           for (final e in entries)
             _PathRow(label: e.$1, path: e.$2, icon: e.$3, isDirectory: e.$4),
         ],
@@ -512,10 +554,20 @@ class _DaemonActionsCardState extends State<_DaemonActionsCard> {
   bool _binaryMissing = false;
   ChannelStatusSnapshot? _channels;
 
+  /// Trimmed length of `~/.chain/hub-auth-token`, or null when
+  /// Studio talks to the hub anonymously. Length only — the
+  /// secret itself never reaches the UI.
+  int? _tokenChars;
+
   @override
   void initState() {
     super.initState();
     _refreshStatus();
+    HubAuthToken.charCount()
+        .then((n) {
+          if (mounted) setState(() => _tokenChars = n);
+        })
+        .catchError((_) {});
   }
 
   Future<void> _refreshStatus() async {
@@ -528,6 +580,21 @@ class _DaemonActionsCardState extends State<_DaemonActionsCard> {
     }
   }
 
+  String _connectionLine(AppLocalizations l) {
+    final ep = HubService.instance.currentEndpoint;
+    final isLocal =
+        ep.host == '127.0.0.1' || ep.host == 'localhost' || ep.host == '::1';
+    final transport = ep.secure
+        ? l.doctorConnTls
+        : isLocal
+        ? l.doctorConnPlainLocal
+        : l.doctorConnPlainRemote;
+    final auth = _tokenChars == null
+        ? l.doctorConnAnonymous
+        : l.doctorConnToken(_tokenChars!);
+    return l.doctorConnLine(ep.toString(), transport, auth);
+  }
+
   Future<void> _run(
     String label,
     Future<({bool ok, String stdout, String stderr})> Function() action,
@@ -626,6 +693,17 @@ class _DaemonActionsCardState extends State<_DaemonActionsCard> {
                 color: theme.colorScheme.onSurfaceVariant,
               ),
             ),
+            const SizedBox(height: 2),
+            // Who-talks-to-whom-how in one line: endpoint,
+            // transport security, and whether a bearer token is
+            // attached — the auditor's baseline questions the
+            // green "connected" dot alone cannot answer.
+            SelectableText(
+              _connectionLine(l),
+              style: theme.textTheme.bodySmall?.copyWith(
+                color: theme.colorScheme.onSurfaceVariant,
+              ),
+            ),
             const SizedBox(height: ChainSpace.md),
             Wrap(
               spacing: ChainSpace.sm,