Add the jobqueue exactly-once demo#4
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A demo distributed system under
examples/jobqueue/: an exactly-once job scheduler written in plain stdlib asyncio (one broker, stateless workers, submitting clients), tested end to end with simloop. Time-based leases with heartbeat renewal, per-job fencing tokens checked at broker and store, idempotency-key submit dedupe, exponential-backoff requeue, and a dead-letter state.The suite runs entirely under seeded simulation: seven fault scenarios (25-50 seeds each), an ablation matrix that removes each safeguard and lets seed exploration find the resulting violation, two defense-in-depth 'stays safe alone' proofs, and a 300-seed chaos campaign of randomized partitions, a worker crash, and poison jobs. Every failure replays from a seed. The bug table lives in
examples/jobqueue/README.md.Product code is stdlib-only (a subprocess test enforces it); simloop rides in the tests only. mypy strict clean and the full suite green on 3.12 and 3.13; the wheel excludes the demo.