refactor: use explicit runtime facade getters

tests/test_agent_scheduled_tasks.py

@@ -1,3 +1,5 @@
+# pylint: disable=no-name-in-module
+
 import asyncio
 import json
 import threading
@@ -801,7 +803,7 @@ async def test_dashboard_schedule_keeps_agent_tasks(monkeypatch) -> None:
         )
     ]
     monkeypatch.setattr(
-        "app.api.endpoints.dashboard.Scheduler",
+        "app.api.endpoints.dashboard.get_scheduler",
         lambda: SimpleNamespace(list=lambda: scheduler_items),
     )