- [x] 1. Add OpenSpec scenario for prompt-accepted metadata.
- [x] 2. Add failing behavior coverage for prompted metadata starts.
- [x] 3. Pass prompted metadata through the scheduler/controller/coordinator start path.
- [x] 4. Populate cached Outlook prompt candidates with metadata.
- [x] 5. Exclude canceled Outlook appointments from recording prompts and metadata lookup.
- [x] 6. Run focused tests, full tests, and `openspec validate use-prompted-calendar-metadata --strict`.