share DaemonBus between backend and kernel, fix terminal spawn timing

The IsolateClient and KernelServices now share the same DaemonBus.
Previously, backend events (pane.output, git.changed) went to a
separate bus that widgets couldn't see.

ClaudePane._spawnWhenReady waits for ProjectOpened before sending
pane.spawn, preventing "No project active" errors.

Recents loaded before runApp so the welcome screen shows them.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

lib/builtin/claude/src/claude_pane.dart

@@ -57,7 +57,7 @@ class _ClaudePaneState extends State<ClaudePane> {
     _terminal = Terminal(maxLines: _maxLines);
     _terminal.onOutput = _onOutput;
     _terminal.onResize = _onResize;
-    WidgetsBinding.instance.addPostFrameCallback((_) => _spawn());
+    WidgetsBinding.instance.addPostFrameCallback((_) => _spawnWhenReady());
   }
 
   @override
@@ -78,6 +78,25 @@ class _ClaudePaneState extends State<ClaudePane> {
     super.dispose();
   }
 
+  Future<void> _spawnWhenReady() async {
+    if (!mounted) return;
+    final kernel = ClideKernel.of(context);
+    if (!kernel.project.isOpen) {
+      // Wait for a project to open before spawning.
+      final c = Completer<void>();
+      late final StreamSubscription<ProjectOpened> sub;
+      sub = kernel.events.on<ProjectOpened>().listen((_) {
+        sub.cancel();
+        if (!c.isCompleted) c.complete();
+      });
+      await c.future.timeout(const Duration(seconds: 10), onTimeout: () {
+        sub.cancel();
+      });
+      if (!mounted) return;
+    }
+    return _spawn();
+  }
+
   Future<void> _spawn() async {
     if (!mounted) return;
     final ipc = _ipc();