Async Archive-Review Agent — Scoping & Durability Checklist

One page: the review loop run as a fleet over a queue; the cost funnel (cheap filter -> keyframe sampler -> reader -> judge) with the 450x reduction arithmetic; the no-clock economics (batch APIs at 50% off, spot compute); the durability spine (checkpoint, idempotency key, retry + dead-letter queue, durable orchestration) so a crash resumes instead of restarting; versioned re-processing; and human-in-the-loop-by-exception (confidence threshold + severity + sampling).