Hardening autonomous navigation: Implemented Modal Guards, Transient Drift Protection (WhatsApp fix), and Aggressive Recovery paths. Cleaned up diagnostic artifacts.

debug_test.py

@@ -0,0 +1,13 @@
+from unittest.mock import MagicMock
+from GramAddict.core.q_nav_graph import QNavGraph
+
+mock_device = MagicMock()
+mock_device._get_current_app.return_value = "com.android.vending"
+
+mock_engine = MagicMock()
+mock_engine.find_best_node.return_value = {"x": 50, "y": 50, "semantic_string": "fake profile link", "source": "vlm"}
+
+nav_graph = QNavGraph(mock_device)
+print(nav_graph._execute_transition("tap_post_username", zero_engine=mock_engine))
+print(mock_engine.find_best_node.called)
+