v0.4.13

### Added
- Canonical Documentation backlink at the bottom of every `SKILL.md` linking to the docs site (`[Documentation](https://jeffallan.github.io/claude-skills/skills/{domain}/{skill-name}/)`), so skill aggregators (skills.sh, etc.) that consume raw source markdown render a real `<a href>` backlink to the docs site for SEO. The docs build pipeline (`syncSkillPages` in `site/scripts/sync-content.mjs`) strips this line at build time, so the docs site, public markdown mirrors, `llms.txt`, and `llms-full.txt` render cleanly without self-references. Documented the convention in CLAUDE.md.

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**Documentation:** https://jeffallan.github.io/claude-skills/