Retry bounded Windows EPERM, EACCES, and EBUSY rename failures for asynchronous and startup outbox persistence while preserving atomic writes and immediate failure for permanent errors.
Include immediately cleaned successful files and byte aggregates when finalizing package results so mixed cleanup states remain partial instead of failed.
Carry additive download, offline, extraction, remux, and cleanup failure counters alongside the prioritized display phase, aggregate them into run results, and expose cleanup failures in the final summary.
Reserve the actively delivered outbox event while the external sender is pending so concurrent persistence cannot evict it through expiry or capacity enforcement. Apply the delivery outcome under the exclusive chain before normal cleanup resumes, preserving retry state, delivery acknowledgements, and cooldown timing without duplicate sends. Add deterministic concurrency regressions for expiry-success and capacity-failure races.
Enforce one shared shutdown deadline while persisting late digests during blocked sends. Start stall cooldowns from serialized delivery acknowledgements, atomically rewrite cleaned legacy outboxes, retain run summaries for 24 hours, and prevent duplicate history or synthetic post-process start times.
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