fix(broadcast): migrate WebSocketServer.broadcast() callers to WebSocketMessage signature

Phase 5 of any_type_componentization_20260621 changed
WebSocketServer.broadcast(channel, payload) -> broadcast(message: WebSocketMessage)
but did not update internal callers. This produced worker[queue_fallback]
TypeError spam on the GUI thread.

Fixed 2 sites:
- src/app_controller.py:1849 _process_pending_gui_tasks (telemetry broadcast)
- src/events.py:115 AsyncEventQueue.put (events broadcast)

gui_2.py has no internal broadcast callers (grep verified).

Both callers now construct WebSocketMessage(channel=, payload=) at the call site.
test_websocket_broadcast_regression.py 4/4 pass (was 1/4 failing in red phase).

src/app_controller.py

@@ -1841,12 +1841,13 @@ class AppController:
 
  def _process_pending_gui_tasks(self) -> None:
   """Processes pending GUI tasks from the queue on the main render thread."""
+  from src.api_hooks import WebSocketMessage
   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)
+    self.event_queue.websocket_server.broadcast(WebSocketMessage(channel="telemetry", payload=metrics))
 
   if not self._pending_gui_tasks: return
 

src/events.py

@@ -34,6 +34,8 @@ import queue
 from pathlib import Path
 from typing  import Callable, Any, Dict, List, Tuple, Optional
 
+from src.api_hooks import WebSocketMessage
+
 
 class EventEmitter:
  """
@@ -112,7 +114,7 @@ class AsyncEventQueue:
    elif hasattr(payload, '__dict__'):
     serializable_payload = vars(payload)
    
-   self.websocket_server.broadcast("events", {"event": event_name, "payload": serializable_payload})
+   self.websocket_server.broadcast(WebSocketMessage(channel="events", payload={"event": event_name, "payload": serializable_payload}))
 
  def get(self) -> Tuple[str, Any]:
   """