* feat: restructure skills for ClawHub publishing with CI auto-publish
- Sync core skill to 54 commands (add notification commands)
- Move macOS skill from .claude/skills/ to git-tracked skills/
- Extract Notification Center section to references/notifications.md
- Add ClawHub metadata (version, tags, requirements) to all SKILL.md
- Remove macos.md from core skill (moved to platform skill)
- Create scripts/link-skills.sh for local dev symlinks
- Add publish-skills CI job to release.yml (ClawHub auto-publish)
- Add skill install prompt to npm postinstall
* refactor: consolidate macOS into single agent-desktop skill
Merge agent-desktop-macos back into agent-desktop/references/macos.md
as a single publishable skill. Includes Notification Center content
inline rather than as a separate reference file.
