chore(tech-debt): Finalize gui_2.py cleanup and test suite discipline

tests/test_gui2_mcp.py

@@ -5,23 +5,6 @@ from gui_2 import App
 import ai_client
 from events import EventEmitter
 
-@pytest.fixture
-def app_instance() -> Generator[App, None, None]:
- if not hasattr(ai_client, 'events') or ai_client.events is None:
-  ai_client.events = EventEmitter()
- with (
-  patch('gui_2.load_config', return_value={'ai': {}, 'projects': {}}),
-  patch('gui_2.save_config'),
-  patch('gui_2.project_manager'),
-  patch('gui_2.session_logger'),
-  patch('gui_2.immapp.run'),
-  patch.object(App, '_load_active_project'),
-  patch.object(App, '_fetch_models'),
-  patch.object(App, '_load_fonts'),
-  patch.object(App, '_post_init')
- ):
-  yield App()
-
 def test_mcp_tool_call_is_dispatched(app_instance: App) -> None:
  """
     This test verifies that when the AI returns a tool call for an MCP function,