fix(redis): cut workers to 7 total, remove per-iteration Redis calls to reduce connection pressure

fix(redis): use correct redis.exceptions import to re-raise ConnectionError

fix(redis): increase pool max_connections to 50, add exponential backoff on ConnectionError

refactor(redis-queue): reduce logging verbosity in enqueue and dequeue operations

refactor(sync-worker-ms): reduce logging verbosity in worker loop and queue operations

first commit