ECC/docker/context-profiles/complex-eval/cases/webhook-relay/query.md

The webhook relay in this repo accepts delivery requests but never actually sends them — the delivery worker was never finished, and customers are losing notifications. Implement asynchronous delivery per the README: POST each delivery's JSON payload to its URL, retry failures with exponential backoff starting around 100ms and doubling each time, give up after 5 total attempts and mark the delivery dead. Keep the documented module contract, make npm test pass, and extend the test suite to cover the retry and dead-letter behavior.