test: live cluster resharding coverage - #13
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Add tests/test_integration_cluster_resharding.py: performs a real CLUSTER SETSLOT + MIGRATE handshake on the multi-node CI cluster while a lease is outstanding, then drives lease renewal, ack, and a fresh publish/claim cycle through the gateway, pinning redis-py's transparent MOVED-following below client.eval. Gated on REDIS_CLUSTER_URL like its siblings; migrates the slot back afterwards so cluster state stays clean. Wire the new file into the real-redis-cluster CI job.
The cluster-coverage bullet now reflects that transparent MOVED-following during a live slot migration is exercised in CI, narrowing the remaining gap to partial/failed-migration redirects, multi-slot resharding storms, and the exhausted-redirect-retries degraded path (simulation-only).
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Adds a live slot-migration (resharding) integration test against the real multi-node CI cluster: CLUSTER SETSLOT + MIGRATE handshake while a lease is outstanding, then lease renewal, ack, and a fresh claim through the gateway — pinning redis-py's transparent MOVED-following below client.eval. Gated on REDIS_CLUSTER_URL; wired into the real-redis-cluster CI job. Draft for CI proof only — do not merge via GitHub; the orchestrator merges locally.