test(ui): classify lifecycle regression as conditional

tests/test_app_model_lifecycle.py

@@ -5,7 +5,10 @@ from __future__ import annotations
 import subprocess
 import sys
 
+import pytest
 
+
+@pytest.mark.operator_ui
 def test_active_checkpoint_survives_cleanup_and_remains_chat_recoverable(tmp_path):
     """Exercise app state in isolation from Gradio's import-time worker sockets."""
     script = r'''