feat(cluster): fence worker-connection ownership with a monotonic epoch

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A worker whose link is silently broken reconnects to another replica while
the old owner's socket has not yet noticed. Without a fence both believe
they own it. Claim is a single atomic upsert returning the new epoch, and a
release must match both owner and epoch so a stale owner cannot delete a
live claim.

Assisted-by: Claude Opus 5 [claude-code]
Signed-off-by: Ettore Di Giacinto <mudler@localai.io>

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