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SKILL.md references `--action backup` in the evolution mode workflow
(both Chinese and English versions), but version_manager.py only
accepted list/rollback/cleanup — causing an error whenever a user
tried to update a colleague skill via the documented command.
Adds backup_current_version() which archives the current SKILL.md,
work.md and persona.md into versions/{current_version}/ before an
update, consistent with how skill_writer.py handles versioning
internally.
Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>