6d4a09a0c6
poll_messages now collects all queued messages, returns them, then deletes them from sled. No more duplicate delivery. This is correct for store-and-forward: once the client receives the messages, the server's job is done. If the client crashes before processing, the messages are lost — acceptable for Phase 1. Phase 2 can add explicit ack-based delivery if needed. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>