queueCTL — Design notes

### Summary queueCTL is a CLI-first background job system designed to be simple to operate while providing good defaults for reliability. It uses a worker-pool model with bounded queues and back-pressure to avoid overloading downstream systems. Key points - Worker pools with configurable concurrency - At-least-once delivery with exponential backoff retries - Idempotent job handlers to tolerate duplicate runs - Graceful shutdown: drain in-flight tasks and expose health endpoints Implementation notes - Keep the scheduler single-threaded to reduce coordination complexity. - Use persistent job queue (local WAL + optional central store) for durability.