Changelog
- 4fad1c7 feat: add comprehensive sandbox integration tests
- 1ee071f feat: add diff, backup, doctor commands and backup mechanism
- 74bac4a feat: add merge mode, make it default
- 0f800f7 feat: add target info/mode commands, show mode in status/doctor
- 245ff29 feat: improve init flow with explicit target selection
- 4261746 refactor: split main.go into separate command files