Functions almost exactly as the readme-sync-audit, but attempts to
identify existing documentation and use that as the "Single Source of
Truth" instead of the README. README will also be updated only when
changes are relevant to the README layout/content.
- Replace Gemini CLI with Antigravity CLI throughout (--gemini kept as
hidden fallback flag; GEMINI_SKILLS_DIR honoured as legacy env var)
- Default install dir updated to ~/.gemini/antigravity-cli/skills
- Add ANTIGRAVITY_SKILLS_DIR env var with GEMINI_SKILLS_DIR fallback
- Add -l/--list flag: lists available skills with one-line descriptions
- Add descriptions.json mapping skill names to short descriptions;
fetch_descriptions() prefers a local copy when running from a clone,
falls back to remote URL for curl-pipe installs
- Document ship-it skill in README (was missing since its addition)
- Fix Manual Install cd path: claude-skills → ai-skills