fix(git): serialize same-key refetch cache mutations#960
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Concurrent refetches of the same cache key could interleave their read-modify-write on a slot. Serialize mutations per cache key without serializing distinct keys. Fixes #805 Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
…ky tx-age sweep run_writer_task registers a writer_task_tx handle in the process-wide tx_registry singleton; the checkpoint tx_age_sweep_* tests read that singleton under #[serial(tx_registry)]. The writer_task.rs tests that spawn a writer task were missing from the group, leaking a longer-lived writer_task_tx into the sweep's oldest() read and intermittently failing the assertion on main CI. Join them to the serial group. No prod change.
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Fixes #805. Per-key serialization; distinct keys stay concurrent; deterministic per-URL key test included. Local gates deferred to CI due to build-lane contention; codex review follows.