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The rate limit manager's budget logic and the delivery-timeout reaper are unit-covered, but the send service's use of them across the service loop was not. Drive the scheduler a tick at a time against a scripted fake processor and a fixed-epoch quota provider — no network, no sleeps — asserting: - a task is charged against the budget exactly once however many rounds delivery takes (firstAdmittedTime guards re-admission); - an over-budget task parks as NextRoundRetry without reaching the processor, then is admitted and delivered on the first tick after the epoch rolls. Two testability seams keep this deterministic without a live relay: an optional sendProcessor override on SendService.new injects the fake, and trySendMessages is exported to drive one loop tick. The task is built directly (like test_delivery_task_reaping) since DeliveryTask.new resolves its shard through a broker provider only registered once the node starts. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>