chore(conductor): Mark track 'Fix Concurrent MMA Live GUI Tests' as complete

Fixes UI flickering between tracks in app_controller.py and an indentation bug in multi_agent_conductor.py that caused workers to crash silently.

src/multi_agent_conductor.py

@@ -529,7 +529,7 @@ def run_worker_lifecycle(ticket: Ticket, context: WorkerContext, context_files:
   if event_queue:
    _queue_put(event_queue, 'mma_stream', {'stream_id': f'Tier 3 (Worker): {ticket.id}', 'text': chunk})
 
- old_comms_cb = ai_client.comms_log_callback
+ old_comms_cb = ai_client.get_comms_log_callback()
  def worker_comms_callback(entry: dict) -> None:
   entry["mma_ticket_id"] = ticket.id
   if event_queue:
@@ -548,7 +548,7 @@ def run_worker_lifecycle(ticket: Ticket, context: WorkerContext, context_files:
   if old_comms_cb:
    old_comms_cb(entry)
 
- ai_client.comms_log_callback = worker_comms_callback
+ ai_client.set_comms_log_callback(worker_comms_callback)
  ai_client.set_current_tier(f"Tier 3 (Worker): {ticket.id}")
  try:
   comms_baseline = len(ai_client.get_comms_log())
@@ -562,7 +562,7 @@ def run_worker_lifecycle(ticket: Ticket, context: WorkerContext, context_files:
    stream_callback=stream_callback
   )
  finally:
-  ai_client.comms_log_callback = old_comms_cb
+  ai_client.set_comms_log_callback(old_comms_cb)
   ai_client.set_current_tier(None)
 
  # THIRD CHECK: After blocking send() returns