- Add Specification Format section to openspec-conventions with:
- Requirement headers for consistent structure
- Scenario headers with bold WHEN/THEN/AND keywords
- Format flexibility for different content types
- Update all CLI command specs to use structured format:
- cli-init: Convert all behavioral sections
- cli-list: Apply structured format throughout
- cli-update: Restructure requirements and edge cases
- cli-diff: Update all behavior sections
- cli-archive: Convert complex behaviors to scenarios
- Update openspec-conventions spec itself to follow its own format
- Mark all tasks as completed