mirrord 3.252.0 clones an S3 bucket per session, extending database branching to object storage

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Released 2026-08-31, mirrord 3.252.0 adds S3 bucket branching via a `{"type": "s3", ...}` source config that gives a session a branch bucket cloned in the provider's cloud, seedable empty, with all objects, or with only objects matching configured regular expressions. Database branch port forwards are now kept alive while another local mirrord session uses them, with sessions attaching to a shared local forward that closes after the last one exits or crashes. It also fixes a bug where the agent could scramble data in tunneled outgoing connections, which is worth noting for anyone who ran 3.251.x against real traffic.