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Document that a failed write, fsync, or replace in _publish_bytes_atomically leaves the previous file intact, and that temporary removal must not replace that error, including interruptions. Add site-specific regression tests for unlink and warning-log failures. The cleanup_failed_atomic_write call itself already landed on main in #7200. Co-authored-by: wannT-1 <200890097+wannT-1@users.noreply.github.com>