fix(mma): Unblock visual simulation - event routing, loop passing, adapter preservation

Three independent root causes fixed:
- gui_2.py: Route mma_spawn_approval/mma_step_approval events in _process_event_queue
- multi_agent_conductor.py: Pass asyncio loop from ConductorEngine.run() through to
  thread-pool workers for thread-safe event queue access; add _queue_put helper
- ai_client.py: Preserve GeminiCliAdapter in reset_session() instead of nulling it

Test: visual_sim_mma_v2::test_mma_complete_lifecycle passes in ~8s

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

gui_2.py

@@ -388,6 +388,7 @@ class App:
    'btn_mma_accept_tracks': self._cb_accept_tracks,
    'btn_mma_start_track': self._cb_start_track,
    'btn_approve_tool': self._handle_approve_tool,
+   'btn_approve_mma_step': self._handle_approve_mma_step,
    'btn_approve_spawn': self._handle_approve_spawn,
   }
   self._predefined_callbacks: dict[str, Callable[..., Any]] = {
@@ -880,8 +881,17 @@ class App:
      self.mma_status = payload.get("status", "idle")
      self.active_tier = payload.get("active_tier")
      self.mma_tier_usage = payload.get("tier_usage", self.mma_tier_usage)
-     self.active_track = payload.get("track")
      self.active_tickets = payload.get("tickets", [])
+     track_data = payload.get("track")
+     if track_data:
+      tickets = []
+      for t_data in self.active_tickets:
+       tickets.append(Ticket(**t_data))
+      self.active_track = Track(
+       id=track_data.get("id"),
+       description=track_data.get("title", ""),
+       tickets=tickets
+      )
     elif action == "set_value":
      item = task.get("item")
      value = task.get("value")
@@ -996,6 +1006,16 @@ class App:
   else:
    print("[DEBUG] No pending tool approval found")
 
+ def _handle_approve_mma_step(self) -> None:
+  """Logic for approving a pending MMA step execution via API hooks."""
+  print("[DEBUG] _handle_approve_mma_step called")
+  if self._pending_mma_approval:
+   self._handle_mma_respond(approved=True, payload=self._mma_approval_payload)
+   self._mma_approval_open = False
+   self._pending_mma_approval = None
+  else:
+   print("[DEBUG] No pending MMA step approval found")
+
  def _handle_approve_spawn(self) -> None:
   """Logic for approving a pending sub-agent spawn via API hooks."""
   print("[DEBUG] _handle_approve_spawn called")
@@ -1162,6 +1182,11 @@ class App:
        "action": "mma_state_update",
        "payload": payload
       })
+   elif event_name in ("mma_spawn_approval", "mma_step_approval"):
+    # Route approval events to GUI tasks — payload already has the
+    # correct structure for _process_pending_gui_tasks handlers.
+    with self._pending_gui_tasks_lock:
+     self._pending_gui_tasks.append(payload)
 
  def _handle_request_event(self, event: events.UserRequestEvent) -> None:
   """Processes a UserRequestEvent by calling the AI client."""
@@ -2031,7 +2056,7 @@ class App:
    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)
+    engine = multi_agent_conductor.ConductorEngine(self.active_track, self.event_queue, auto_queue=not self.mma_step_mode)
     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)
@@ -2108,7 +2133,7 @@ class App:
    state = TrackState(metadata=meta, discussion=[], tasks=tickets)
    project_manager.save_track_state(track_id, state, self.ui_files_base_dir)
    # 4. Initialize ConductorEngine and run loop
-   engine = multi_agent_conductor.ConductorEngine(track, self.event_queue)
+   engine = multi_agent_conductor.ConductorEngine(track, self.event_queue, auto_queue=not self.mma_step_mode)
    # Use current full markdown context for the track execution
    track_id_param = track.id
    flat = project_manager.flat_config(self.project, self.active_discussion, track_id=track_id_param)