Add CI, search, ref-based commands, client-side enrichment
- GitHub Actions CI with fmt, clippy, test, build
- Search/filter bookmarks by title, URL, description
- Ref-based bookmark resolution (rkey prefix matching)
- Client-side URL enrichment with HTML parsing and sanitization
- JSON output mode for list and tags commands
- Terminal-aware display with unicode width handling
- Notes support on bookmarks via annotation sidecar