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Introduces REDIS_SOCKET_KEEPALIVE and wires socket_keepalive=True through to every Redis client created by get_redis_connection (plain, cluster and sentinel paths, sync and async). When enabled, the kernel sends TCP keepalive probes on idle connections so half-closed sockets (e.g. after a silent firewall/LB reset or a NIC flap) are detected before the next command lands on them and the request never sees a "Connection reset by peer" error. Defaults to off so existing deployments see no behavioural change. Operators who want the protection set REDIS_SOCKET_KEEPALIVE=true in their environment. Co-authored-by: Claude <noreply@anthropic.com>