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- max_attempts enforcement in start_attempt: raises AttemptLimitError when quota of finalized attempts is exhausted (in_progress not counted) - Timer enforcement: start_attempt sets expired_at = now + time_limit_seconds; check_attempt_not_expired auto-finalizes and raises AttemptExpiredError on deadline breach - finalize_timed_out_attempt: grades partial responses, sets TIMED_OUT status - expire_timed_out_attempts Celery task: idempotent sweep of overdue in-progress attempts - Views: 409 on limit breach (start), 410 on expired response submit; timed_out result on submit - 14 unit + integration tests covering policy boundary conditions and API responses Co-Authored-By: Paperclip <noreply@paperclip.ing>