fix: improve maintenance and synchronize live conversations

backend/tests/utils/test_guardrail_runtime.py

@@ -18,7 +18,7 @@ from unittest.mock import patch
 
 import pytest
 
-from app.agents.guardrail_policy import CANARY_STRINGS, looks_like_scope_refusal
+from app.agents.guardrail_policy import CANARY_STRINGS
 from app.utils.guardrail_runtime import (
     BLOCK_REPLY,
     LEAK_REPLY,