chore: migrate autonomous navigation to GOAP and finalize 100% E2E test stabilization

- Delegate legacy BFS navigation to structure-based GOAP system
- Harden Situational Awareness Engine (SAE) for modal and obstacle clearance
- Fix device sizing calculations during mocked humanized scrolls
- Remove deprecated V8 test stubs and legacy debug entrypoints
- Stabilize Telepathic Engine context parsing thresholds
Result: 66/66 E2E and integration tests passing

tests/conftest.py

@@ -52,6 +52,9 @@ class MockDevice:
     def cm_to_pixels(self, cm):
         return cm * 10
         
+    def dump_hierarchy(self):
+        return self.deviceV2.dump_hierarchy()
+        
     def click(self, x=None, y=None, obj=None):
         if obj:
             x, y = obj.get("x", 0), obj.get("y", 0)