fix(insta-render): BLMOVE dequeue가 짧은 socket_timeout으로 깨지던 문제 해결

REDIS_URL의 socket_timeout(<5s)이 ReliableQueue BLMOVE 5초 블록보다 짧아
idle dequeue마다 "Timeout reading"으로 잡을 못 꺼내 슬레이트가 draft에 정지(~2026-05-22~).
큐 연결을 socket_timeout=None + socket_keepalive로 생성(make_queue_redis)해 정상화.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

services/insta-render/tests/test_worker.py

@@ -222,3 +222,14 @@ async def test_poll_once_returns_false_on_timeout(monkeypatch):
     process_mock.assert_not_awaited()
     fake_queue.ack.assert_not_awaited()
     fake_queue.fail.assert_not_awaited()
+
+
+def test_make_queue_redis_no_read_timeout():
+    """BLMOVE(블록 5s) dequeue가 read-timeout으로 깨지지 않도록 socket_timeout=None 보장 (회귀 가드)."""
+    import os, sys
+    _here = os.path.dirname(os.path.abspath(__file__))
+    sys.path.insert(0, os.path.dirname(_here))                      # services/insta-render
+    sys.path.insert(0, os.path.dirname(os.path.dirname(_here)))     # services (_shared)
+    import worker
+    c = worker.make_queue_redis()
+    assert c.connection_pool.connection_kwargs.get("socket_timeout") is None