perf: avoid duplicate bootstrap work on join

apps/chanora_flutter/lib/services/app_bootstrap.dart

@@ -1,6 +1,7 @@
-import 'dart:io' show File;
+import 'dart:io' show Directory, File;
 
 import 'package:connectivity_plus/connectivity_plus.dart';
+import 'package:flutter/foundation.dart' show visibleForTesting;
 import 'package:flutter/services.dart';
 import 'package:package_info_plus/package_info_plus.dart';
 import 'package:path_provider/path_provider.dart';
@@ -9,7 +10,19 @@ import '../src/rust/api.dart' as rust;
 
 const String appSemverBaseline = 'v0.1.0';
 const String _sileroVadAsset = 'assets/models/silero_vad.onnx';
-const String _tenVadAsset = 'assets/models/ten_vad.onnx';
+
+typedef StorageDirectoryProvider = Future<Directory> Function();
+typedef StorageInitializer = Future<void> Function(String dir);
+
+Future<void>? _storageInitFuture;
+Future<void>? _vadBootstrapFuture;
+StorageDirectoryProvider _storageDirectoryProvider =
+    getApplicationSupportDirectory;
+StorageInitializer _storageInitializer = _defaultStorageInitializer;
+
+Future<void> _defaultStorageInitializer(String dir) {
+  return rust.initStorage(dir: dir);
+}
 
 Future<File> _copyBundledAssetToDocuments({
   required String assetPath,
@@ -29,16 +42,28 @@ Future<File> _copyBundledAssetToDocuments({
 }
 
 Future<void> configureBundledVadModels() async {
+  final existing = _vadBootstrapFuture;
+  if (existing != null) {
+    await existing;
+    return;
+  }
+
+  final bootstrap = _configureBundledVadModelsImpl();
+  _vadBootstrapFuture = bootstrap;
+  try {
+    await bootstrap;
+  } catch (_) {
+    _vadBootstrapFuture = null;
+    rethrow;
+  }
+}
+
+Future<void> _configureBundledVadModelsImpl() async {
   final silero = await _copyBundledAssetToDocuments(
     assetPath: _sileroVadAsset,
     fileName: 'silero_vad.onnx',
   );
-  final ten = await _copyBundledAssetToDocuments(
-    assetPath: _tenVadAsset,
-    fileName: 'ten_vad.onnx',
-  );
   await rust.setVadModelPath(path: silero.path);
-  await rust.setTenVadModelPath(path: ten.path);
 }
 
 /// Resolve the human-readable app version displayed in About.
@@ -69,15 +94,45 @@ String appVersionFromBuildNumber({
 }
 
 Future<void> wireStorage() async {
+  final existing = _storageInitFuture;
+  if (existing != null) {
+    await existing;
+    return;
+  }
+
+  final initFuture = _wireStorageImpl();
+  _storageInitFuture = initFuture;
+  await initFuture;
+}
+
+Future<void> _wireStorageImpl() async {
+  var initialized = false;
   try {
-    final dir = await getApplicationSupportDirectory();
-    await rust.initStorage(dir: dir.path);
+    final dir = await _storageDirectoryProvider();
+    await _storageInitializer(dir.path);
+    initialized = true;
   } catch (_) {
     // Best-effort; missing storage just means no identity persistence
     // and no bookmark list this session.
+  } finally {
+    if (!initialized) {
+      _storageInitFuture = null;
+    }
   }
 }
 
+@visibleForTesting
+void debugResetStorageBootstrap({
+  StorageDirectoryProvider? storageDirectoryProvider,
+  StorageInitializer? storageInitializer,
+}) {
+  _storageInitFuture = null;
+  _vadBootstrapFuture = null;
+  _storageDirectoryProvider =
+      storageDirectoryProvider ?? getApplicationSupportDirectory;
+  _storageInitializer = storageInitializer ?? _defaultStorageInitializer;
+}
+
 rust.BridgeNetworkState _mapConnectivity(List<ConnectivityResult> results) {
   if (results.isEmpty) return rust.BridgeNetworkState.unknown;
   final allNone = results.every((r) => r == ConnectivityResult.none);

apps/chanora_flutter/test/services/app_bootstrap_test.dart

@@ -1,8 +1,19 @@
+import 'dart:async';
+import 'dart:io';
+
 import 'package:flutter_test/flutter_test.dart';
 
 import 'package:chanora_flutter/services/app_bootstrap.dart';
 
 void main() {
+  setUp(() {
+    debugResetStorageBootstrap();
+  });
+
+  tearDown(() {
+    debugResetStorageBootstrap();
+  });
+
   test('app version appends platform build number', () {
     expect(
       appVersionFromBuildNumber(
@@ -19,4 +30,58 @@ void main() {
       'v1.2.3-rc.4',
     );
   });
+
+  test('wireStorage reuses the in-flight initialization future', () async {
+    final completer = Completer<void>();
+    final tempDir = await Directory.systemTemp.createTemp(
+      'chanora-app-bootstrap-test',
+    );
+    addTearDown(() => tempDir.delete(recursive: true));
+
+    var initCalls = 0;
+    debugResetStorageBootstrap(
+      storageDirectoryProvider: () async => tempDir,
+      storageInitializer: (dir) async {
+        initCalls += 1;
+        await completer.future;
+      },
+    );
+
+    final first = wireStorage();
+    final second = wireStorage();
+    var secondCompleted = false;
+    second.then((_) => secondCompleted = true);
+
+    await Future<void>.delayed(Duration.zero);
+    expect(initCalls, 1);
+    expect(secondCompleted, isFalse);
+
+    completer.complete();
+    await Future.wait([first, second]);
+    expect(initCalls, 1);
+    expect(secondCompleted, isTrue);
+  });
+
+  test('wireStorage retries after a failed initialization attempt', () async {
+    final tempDir = await Directory.systemTemp.createTemp(
+      'chanora-app-bootstrap-test',
+    );
+    addTearDown(() => tempDir.delete(recursive: true));
+
+    var initCalls = 0;
+    debugResetStorageBootstrap(
+      storageDirectoryProvider: () async => tempDir,
+      storageInitializer: (dir) async {
+        initCalls += 1;
+        if (initCalls == 1) {
+          throw const FileSystemException('boom');
+        }
+      },
+    );
+
+    await wireStorage();
+    await wireStorage();
+
+    expect(initCalls, 2);
+  });
 }