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5a9f518bdd
Two defects the send-service seam had once admission actually enforces, both fixed by a single DeliveryTask.firstAdmittedTime field: - The retry loop gated admission on firstPropagatedTime.isNone(), so a task that failed to propagate (e.g. no peers) was re-admitted on every 1s tick, re-charging the epoch budget and — with the shipped default of one message per epoch — starving all other traffic. Admission is now gated on firstAdmittedTime.isNone(): a task charges one slot / draws one nonce for its lifetime, and retries reuse it. - reportTaskResult reaped any never-propagated task older than MaxTimeInCache (60s) measured from message creation, so an over-budget task parked for a 600s epoch was hard-failed with a misleading "Unable to send within retry time window" long before the epoch could roll (issue #4049). The reaper now runs only for admitted tasks and measures from admission, so a task waiting for epoch budget is exempt and gets a full delivery window once it is finally admitted. The RLN-rejection branch in both processors resets firstAdmittedTime along with clearing the proof, so the regenerated proof's fresh nonce is re-admitted rather than sent uncharged. The reap decision is extracted to DeliveryTask.isDeliveryTimedOut and unit-tested (tests/messaging/test_delivery_task_reaping.nim); a scheduler-level integration test of park-and-release is a follow-up. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>