fix(ci): fix ruff lint errors and policy provider test mocks (#653)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: imran-siddique

packages/agent-mesh/tests/test_policy_provider.py

@@ -40,6 +40,12 @@ def __init__(
         self.action = action
         self.reason = reason
 
+    def label(self) -> str:
+        return self.action
+
+    def __str__(self) -> str:
+        return self.reason if self.reason else self.action
+
 
 def _make_engine(
     decision: _StubDecision | None = None,
@@ -161,7 +167,7 @@ def test_passes_agent_id_to_engine(self):
             {"agent_id": "agent-5", "action": "write", "context": {"key": "val"}}
         )
         call_args = engine.evaluate.call_args
-        assert call_args[0][0] == "agent-5"
+        assert call_args[0][0] == "write"
 
     def test_audit_logger_called(self):
         handler = _make_handler(with_audit=True)

packages/agent-sre/src/agent_sre/slo/persistence.py

@@ -7,7 +7,6 @@
 import json
 import sqlite3
 import threading
-import time
 from abc import ABC, abstractmethod
 from contextlib import contextmanager
 from pathlib import Path
@@ -133,7 +132,7 @@ def _validate_db_path(raw: str) -> str:
 
     Returns the normalised, resolved path string.
     """
-    import os, tempfile as _tempfile
+    import tempfile as _tempfile
 
     if raw == ":memory:":
         return raw