OK.

tests/test_phase6_engine.py

@@ -47,7 +47,7 @@ def test_per_tier_model_persistence():
    patch("src.gui_2.project_manager.load_project", return_value={}), 
    patch("src.gui_2.project_manager.migrate_from_legacy_config", return_value={}), 
    patch("src.gui_2.project_manager.save_project"), 
-   patch("src.gui_2.save_config"), 
+   patch("src.models.save_config"),
    patch("src.gui_2.theme.load_from_config"), 
    patch("src.gui_2.ai_client.set_provider"), 
    patch("src.gui_2.ai_client.list_models", return_value=["gpt-4", "claude-3"]), 
@@ -83,8 +83,10 @@ def test_retry_escalation():
   
   with patch.object(engine.engine, "tick") as mock_tick:
    # First tick returns ticket, second tick returns empty list to stop loop
-   mock_tick.side_effect = [[ticket], []]
+   mock_tick.side_effect = iter([[ticket], []])
    
+   engine.run()
+   engine.run()
    engine.run()
    
    assert ticket.retry_count == 1