fix: resolve CI lint and test failures in agent-os and agent-mesh

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

Author: imran-siddique

packages/agent-os/src/agent_os/policies/backends.py

@@ -30,7 +30,7 @@
 import shutil
 import subprocess
 import tempfile
-from dataclasses import dataclass, field
+from dataclasses import dataclass
 from datetime import datetime, timezone
 from pathlib import Path
 from typing import Any, Literal, Optional, Protocol, runtime_checkable

packages/agent-os/src/agent_os/policies/policy_schema.json

@@ -36,9 +36,6 @@
       "$ref": "#/definitions/A2AConversationPolicy",
       "description": "Policy for A2A conversation monitoring and feedback loop prevention."
     }
-  },
-      "additionalProperties": false
-    }
   },
   "additionalProperties": false,
   "definitions": {