[yordis]

• A reopen that resets the local copy could race the commit-graph task a push left running; that task wrote into the directory being removed, so the reset failed with DirectoryNotEmpty and the create/open tests flaked on CI.

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Reviewing files that changed from the base of the PR and between fa1dd1a and 7d2edfa.

Files selected for processing: 2

• crates/walgit-wal/src/publish.rs
• crates/walgit-wal/tests/wal.rs

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PR Summary

Medium Risk
Changes locking and liveness on the async post-publish path; behavior is aligned with existing pack/sync guards but could affect timing of commit-graph updates under contention.

Overview
Fixes a race where the background commit-graph task spawned after a successful push could keep writing into the local repo directory while open/create was resetting or wiping that same directory, which surfaced as DirectoryNotEmpty and flaky create/open tests on CI.

The post-publish task now takes pack_mutex (via the same timed lock helper used elsewhere) before maintain_commit_graph, and exits immediately if ensure_live() fails so retired handles do not touch disk after a reopen or recreate.

Integration tests that simulate restart by dropping the registry and opening a new one use a new restart_config helper that sets git.commit_graph = false, because an in-process “restart” does not stop the old background task the way a real process restart would.

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