feat(api): implement websocket gateway and event streaming for phase 1

src/app_controller.py

@@ -150,7 +150,7 @@ class AppController:
   self.disc_roles: List[str] = []
   self.files: List[str] = []
   self.screenshots: List[str] = []
-  self.event_queue: events.SyncEventQueue = events.SyncEventQueue()
+  self.event_queue: events.AsyncEventQueue = events.AsyncEventQueue()
   self._loop_thread: Optional[threading.Thread] = None
   self.tracks: List[Dict[str, Any]] = []
   self.active_track: Optional[models.Track] = None
@@ -188,6 +188,7 @@ class AppController:
    "Tier 4": {"input": 0, "output": 0, "provider": "gemini", "model": "gemini-2.5-flash-lite", "tool_preset": None},
   }
   self.perf_monitor: performance_monitor.PerformanceMonitor = performance_monitor.PerformanceMonitor()
+  self._last_telemetry_time: float = 0.0
   self._pending_gui_tasks: List[Dict[str, Any]] = []
   self._api_event_queue: List[Dict[str, Any]] = []
   # Pending dialogs state moved from App
@@ -522,6 +523,14 @@ class AppController:
     })
 
  def _process_pending_gui_tasks(self) -> None:
+  # Periodic telemetry broadcast
+  now = time.time()
+  if hasattr(self, 'event_queue') and hasattr(self.event_queue, 'websocket_server') and self.event_queue.websocket_server:
+   if now - self._last_telemetry_time >= 1.0:
+    self._last_telemetry_time = now
+    metrics = self.perf_monitor.get_metrics()
+    self.event_queue.websocket_server.broadcast("telemetry", metrics)
+
   if not self._pending_gui_tasks:
    return
   sys.stderr.write(f"[DEBUG] _process_pending_gui_tasks: processing {len(self._pending_gui_tasks)} tasks\n")