[BoxBoxJason]

Summary

Search and link preview metadata for https://boxboxjason.github.io/achievements/.

• Site metadata (docs/hugo.toml): a home page description, a social preview card (docs/static/images/social.png, 1200x630, rendered with hugo-theme's tools/social-card.mjs), and project structured data: repository, MIT license, TypeScript, Visual Studio Code. A static mount was added, since this site lists its mounts explicitly.
• Page descriptions: every page has a specific description of 50 to 160 characters. The generated Commands, Settings and Achievements catalogue pages get theirs from scripts/generate-docs.ts, so npm run docs:check still covers them.
• Theme: pinned to hugo-theme b0b7836 on main, in both docs/go.mod and the workflow. It adds:
  • JSON-LD: SoftwareSourceCode on the home page, TechArticle on the other pages;
  • a robots.txt pointing at the sitemap;
  • the other projects in the footer;
  • a docs workflow check that fails when a page has no description.
• Packaging is unchanged: docs/static is not in the VSIX (npm pack --dry-run).

Test plan

• npm run check-types, npm run lint and npm run docs:check pass. docs:check fails when a generated description is edited by hand.
• The theme's description check passes, with no length warnings.
• The site builds with --panicOnWarning. The home and page <meta name="description"> tags are the written ones; og:image and twitter:image resolve under /achievements/; the JSON-LD parses.
• All 275 internal links and anchors were checked with a script, with 0 problems. The panel GIF and the social card are both served.
• The docs workflow passes on this PR.