- Replace deprecated 'prefix' with 'match_archives: sh:backup-*'
- Replace deprecated hooks (before_actions, after_backup, on_error) with new 'commands' syntax
- Use structured command format with name, when, and run fields
- Removes all deprecation warnings from borgmatic config validate
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Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>