fix: quote SKILL.md descriptions with unquoted colons

fix: quote SKILL.md descriptions with unquoted colons The colon-space sequences left behind by #905's em-dash-to-colon sweep make these six front-matter blocks invalid YAML, so skills.sh skips them during discovery and they can't be installed via `npx skills`. Quoting the description scalar fixes parsing without changing the wording. Fixes #907 Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

What happened

The commit addressed an issue with SKILL.md files where unquoted colons rendered some YAML blocks invalid. This change ensures those skills can now be discovered and installed correctly.

Why it matters

This fix is crucial for developers utilizing the skills framework, as it directly impacts the ability to properly install and use specific skills without encountering errors. Improved parsing enhances workflow efficiency and usability.

Sources