test(e2e): decompose monolithic test suite and fortify semantic guards

tests/e2e/conftest.py

@@ -135,17 +135,15 @@ def iteration_guard():
 
 
 @pytest.fixture(scope="function", autouse=True)
-def isolated_screen_memory():
+def isolated_screen_memory(monkeypatch):
     """Ensures we use a separate Qdrant collection for E2E tests and clean it.
     This replaces the old Qdrant mock so tests use the REAL database."""
     from GramAddict.core.qdrant_memory import ScreenMemoryDB
 
-    original_init = ScreenMemoryDB.__init__
-
     def test_init(self, *args, **kwargs):
         super(ScreenMemoryDB, self).__init__(collection_name="test_e2e_screens")
 
-    ScreenMemoryDB.__init__ = test_init
+    monkeypatch.setattr(ScreenMemoryDB, "__init__", test_init)
 
     db = ScreenMemoryDB()
     if db.is_connected:
@@ -153,9 +151,6 @@ def isolated_screen_memory():
 
     yield db
 
-    # Restore original
-    ScreenMemoryDB.__init__ = original_init
-
 
 # ═══════════════════════════════════════════════════════
 # Device Dump Injectors