fix(node2): Fix router_healthy initialization in get_dagi_router_agents

- Initialize router_healthy as None instead of False
- Use bool() to ensure proper boolean conversion
- Add info logging for debugging
- This ensures cached router_healthy=True is properly used

services/city-service/routes_city.py

@@ -4573,17 +4573,17 @@ async def get_dagi_router_agents(node_id: str):
     
     # First, try to get router health from node_cache (populated by node-guardian)
     # This is preferred for remote nodes (like NODE2) where direct connection may not work
-    router_healthy = False
+    router_healthy = None
     try:
         metrics = await repo_city.get_node_metrics(node_id)
         if metrics and metrics.get("router_healthy") is not None:
-            router_healthy = metrics.get("router_healthy", False)
-            logger.debug(f"Using router_healthy from node_cache for {node_id}: {router_healthy}")
+            router_healthy = bool(metrics.get("router_healthy", False))
+            logger.info(f"Using router_healthy from node_cache for {node_id}: {router_healthy}")
     except Exception as e:
         logger.debug(f"Failed to get cached router health for {node_id}: {e}")
     
     # Fallback: try direct health check (only works for local nodes like NODE1)
-    if router_healthy is False:
+    if router_healthy is None:
         endpoints = await repo_city.get_node_endpoints(node_id)
         base_url = endpoints.get("router_url")