Note

Medium Risk
Adds new asyncio cluster pub/sub implementation with per-node routing and connection pool management; behavior changes around sharded subscribe/message filtering could impact pubsub consumers if edge cases exist.

Overview
Adds asyncio Redis Cluster pub/sub support via a new ClusterPubSub and a RedisCluster.pubsub() factory that can bind to a specific node (by ClusterNode or host/port) or lazily select one.

Extends asyncio PubSub to track shard channels (SSUBSCRIBE/SUNSUBSCRIBE), resubscribe them on reconnect, treat smessage as a publish event (including observability recording), and include shard subscriptions in the subscribed state.

Updates cluster command mixins so asyncio cluster clients include PubSubCommands, tightens sharded message filtering/round-robin generator behavior (avoids infinite loop when no node pubsubs exist), adds extensive asyncio cluster pubsub tests, and tweaks CI dependency-audit to ignore one additional CVE.

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