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.

tests/mock_concurrent_mma.py

@@ -71,7 +71,7 @@ def main() -> None:
  print(json.dumps({
   "type": "message",
   "role": "assistant",
-  "content": "Mock response"
+  "content": f"Mock response. Received prompt: {prompt[:100]}..."
  }), flush=True)
  print(json.dumps({
   "type": "result",

tests/test_mma_concurrent_tracks_stress_sim.py

@@ -32,10 +32,9 @@ def test_mma_concurrent_tracks_stress(live_gui) -> None:
 
  # 1. Setup mock provider
  client.set_value('current_provider', 'gemini_cli')
- client.set_value('gcli_path', f'"{sys.executable}" "{os.path.abspath("tests/mock_gemini_cli.py")}"')
+ client.set_value('gcli_path', f'"{sys.executable}" "{os.path.abspath("tests/mock_concurrent_mma.py")}"')
  client.click('btn_project_save')
  time.sleep(1.0)
-
  # 2. Generate two tracks via Epic
  client.set_value('mma_epic_input', 'STRESS TEST: TRACK A AND TRACK B')
  client.click('btn_mma_plan_epic')