fix: loop_guard GITEA_API default + queue.json validation guard (#951, #952)

tests/loop/test_heartbeat.py

@@ -6,7 +6,6 @@ Acceptance criteria:
 - WebSocket broadcasts include current action and reasoning summary
 """
 
-import asyncio
 from unittest.mock import AsyncMock, patch
 
 import pytest
@@ -81,6 +80,7 @@ class TestHeartbeatWithAdapter:
     @pytest.mark.asyncio
     async def test_on_cycle_callback(self, mock_adapter):
         received = []
+
         async def callback(record):
             received.append(record)
 
@@ -145,9 +145,7 @@ class TestHeartbeatBroadcast:
         ) as mock_ws:
             mock_ws.broadcast = AsyncMock()
             # Patch the import inside heartbeat
-            with patch(
-                "infrastructure.ws_manager.handler.ws_manager"
-            ) as ws_mod:
+            with patch("infrastructure.ws_manager.handler.ws_manager") as ws_mod:
                 ws_mod.broadcast = AsyncMock()
                 hb = Heartbeat(world=mock_adapter)
                 await hb.run_once()