fix(search): let scene incompleteness reach the scope-sentence gate

- a scene-only search whose configs failed lost the scope sentence entirely
- tighten a scene assertion that could pass on unrelated wording
- drop a docstring reference to state that was consolidated away

Author: Sergey

tests/src/unit/test_smart_search_scene_phase25.py

@@ -397,7 +397,10 @@ async def _get_scene(sid: str) -> dict[str, Any]:
         assert "match status is unknown" in reason.lower()
         # Integration-managed scenes are surfaced separately so their
         # 100+ count on Hue installs doesn't read as "everything broken".
-        assert "integration-managed" in reason.lower(), (
+        # Assert the COUNT fragment, not the bare phrase: several clauses
+        # mention "integration-managed", so matching the phrase alone would
+        # pass even if the integration/failure split were not reported at all.
+        assert "2 integration-managed scenes are scored by attribute only" in reason, (
             f"partial_reason should distinguish integration scenes: {reason!r}"
         )