Revert "merge: tier2/phase2_4_5_call_site_completion_20260621 (parent + follow-up + Phase 6e analysis)"

This reverts commit f914b2bcd4, reversing
changes made to 7fef95cc87.

src/app_controller.py

@@ -1841,13 +1841,12 @@ 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(WebSocketMessage(channel="telemetry", payload=metrics))
+    self.event_queue.websocket_server.broadcast("telemetry", metrics)
 
   if not self._pending_gui_tasks: return