fix: 나노 검증 — health URL/response polling/startup 상태변경 3건 수정

1. health_check: /../health → /health (URL 해석 오류)
2. response polling: startup pending 제외 (불필요한 HTTP 요청 방지)
3. startup pending 상태변경: pending→skip, auto_resolved/expired→forward

bridge.py

@@ -253,7 +253,7 @@ class RemoteTransport(BridgeTransport):
 
     async def health_check(self) -> bool:
         """Check if Gateway is reachable."""
-        result = await self._arequest("GET", "/../health")
+        result = await self._arequest("GET", "/health")
         return result is not None and result.get("status") == "ok"
 
     # ─── Async methods (used by Collector) ───