Detect OpenCode promptAsync calls that return before a child session has any durable message, and surface a prompt acceptance error before the generic five-minute sync poll timeout.
Add a failing-first regression for the idle zero-message case and keep the existing durable-message completion path covered.
Debugging-Journal: .debugging
- Extract getMessageDir to message-dir.ts
- Extract executeBackground to background-executor.ts
- Extract session creation logic to session-creator.ts
- Extract polling logic to completion-poller.ts
- Extract message processing to message-processor.ts
- Create sync-executor.ts to orchestrate sync execution
- Add ToolContextWithMetadata type to types.ts
- tools.ts now <200 LOC and focused on tool definition