chore(mma): Clean up mma_exec.py and robustify visual simulation mocking

gui_2.py

@@ -2016,6 +2016,23 @@ class App:
   threading.Thread(target=_bg_task, daemon=True).start()
 
  def _cb_start_track(self, user_data: Any = None) -> None:
+  if isinstance(user_data, str):
+   # If track_id is provided directly
+   track_id = user_data
+   # Ensure it's loaded as active
+   if not self.active_track or self.active_track.id != track_id:
+    self._cb_load_track(track_id)
+   
+   if self.active_track:
+    # Use the active track object directly to start execution
+    self.mma_status = "running"
+    engine = multi_agent_conductor.ConductorEngine(self.active_track, self.event_queue)
+    flat = project_manager.flat_config(self.project, self.active_discussion, track_id=self.active_track.id)
+    full_md, _, _ = aggregate.run(flat)
+    asyncio.run_coroutine_threadsafe(engine.run(md_content=full_md), self._loop)
+    self.ai_status = f"Track '{self.active_track.description}' started."
+   return
+
   idx = 0
   if isinstance(user_data, int):
    idx = user_data
@@ -2076,10 +2093,12 @@ class App:
      step_mode=t_data.get("step_mode", False)
     )
     tickets.append(ticket)
-   track_id = f"track_{uuid.uuid5(uuid.NAMESPACE_DNS, f'{self.active_project_path}_{title}_{now.isoformat()}').hex[:12]}"
+   track_id = f"track_{uuid.uuid5(uuid.NAMESPACE_DNS, f'{self.active_project_path}_{title}').hex[:12]}"
    track = Track(id=track_id, description=title, tickets=tickets)
    # Initialize track state in the filesystem
    from models import TrackState, Metadata
+   from datetime import datetime
+   now = datetime.now()
    meta = Metadata(id=track_id, name=title, status="todo", created_at=now, updated_at=now)
    state = TrackState(metadata=meta, discussion=[], tasks=tickets)
    project_manager.save_track_state(track_id, state, self.ui_files_base_dir)