- Replace readline with @inquirer/prompts for all user interactions
- Add arrow key navigation for change selection (consistent with diff command)
- Use confirm() for yes/no prompts with better UX
- Remove manual readline interface management (no longer needed)
- Update tests to mock @inquirer/prompts instead of readline
- Add new test cases for interactive mode behavior
This change provides a consistent user experience across all OpenSpec commands,
where users can navigate options with arrow keys rather than typing numbers.