fix(seo): fix multi-line YAML description parser, add 2 orphan pages to nav
- generate-docs.py: extract_description_from_frontmatter() now handles
multi-line YAML block scalars (|, >, indented continuation) — fixes
14 pages that had 56-65 char truncated descriptions
- mkdocs.yml: add epic-design and research-summarizer to nav (orphan pages)
- Regenerated 251 pages, rebuilt sitemap (278 URLs)
- SEO audit: 0 broken links, 17→3 short descriptions, 278/278 pages
have "Claude Code Skills" in <title>
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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