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>

conductor/tracks/robust_live_simulation_verification/plan.md

@@ -15,4 +15,4 @@
 - [x] Task: Simulate clicking "Approve" and verify the worker's simulated output streams into the correct task detail view.
 
 ## Phase: Review Fixes
-- [ ] Task: Apply review suggestions 605dfc3
+- [x] Task: Apply review suggestions 605dfc3 (already applied; superseded by event routing, loop-passing, and adapter-preservation fixes)