* feat: unify minute artifacts output to ./minutes/{minute_token}/
* fix: tighten path validation and batch-mode --output rejection
* style: translate comments to english and trim historical context
* style: translate leftover chinese comments in vc_notes
* refactor: address review findings across validate ordering, error types, JSON, tests
* fix: sanitize server-provided filename to prevent escape from artifact dir
* style: tighten flag help text for minutes/vc output flags
* docs: update minutes/vc skill docs for unified artifact layout
