Adds 'relicario backup' as a subcommand wrapping export and restore. Stubs return 'not yet implemented' — handlers land in Tasks 8 and 9. The existing top-level 'relicario restore <query>' (un-trash) is untouched.
Adds 'relicario backup' as a subcommand wrapping export and restore. Stubs return 'not yet implemented' — handlers land in Tasks 8 and 9. The existing top-level 'relicario restore <query>' (un-trash) is untouched.