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Track MPSC submissions before publication and complete each ticket when the task runs or is rejected. Make wait and resize drain against the completion protocol, and add blocked-task, nested-submission, and stress regressions for the documented wait contract.
Use atomic submission and completion counters so the MPSC producer path does not acquire a new mutex. Keep the wait condition variable only for blocking callers while preserving the completion barrier.
Update the completion state while holding the wait mutex before notifying condition-variable waiters. This prevents a lost wake-up while keeping the MPSC submission path free of locks.
Give the TaskExecutor wait regression a bounded CTest timeout so a future completion protocol regression fails the suite instead of hanging CI indefinitely.
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Summary
Validation
This is intentionally separate from the merged gzip/benchmark PR #147.