refactor(test): wrap live_gui subprocess in _LiveGuiHandle class

tests/test_gui2_performance.py

@@ -17,14 +17,16 @@ from src.api_hook_client import ApiHookClient
 # Session-wide storage for comparing metrics
 _shared_metrics = {}
 
-def test_performance_benchmarking(live_gui: tuple) -> None:
+def test_performance_benchmarking(live_gui) -> None:
  """
  
   
    Collects performance metrics for the current GUI script over a 5-second window.
    Ensures the application does not lock up and can report its internal state.
  """
- process, gui_script = live_gui
+ handle = live_gui
+ process = handle.process
+ gui_script = handle.gui_script
  client = ApiHookClient()
  # Wait for app to stabilize and render some frames
  time.sleep(3.0)