perf: avoid duplicate bootstrap work on join

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);
+  });
 }