Docs under website/docs were linked with Docusaurus site routes
(`](/getting-started/installation)`, `](/docs/user-guide/x)`), which GitHub's
file viewer resolves as repository paths and 404s (#114428). Relative Markdown
file links (`](../user-guide/x.md#anchor)`) are followed by both GitHub and
Docusaurus, so that becomes the authoring convention:
- website/scripts/check_doc_links.py lints hand-authored EN + zh-Hans pages
for route-style links (`--fix` rewrites them, refusing any route that maps
to no doc file); wired into the Docs Site Checks workflow and
tests/website/test_check_doc_links.py.
- generate-skill-docs.py emits the same relative form for related-skill and
catalog links instead of `/docs/user-guide/skills/...`.
- src/remark/relativeDocLinks.js rewrites `./x.md`/`../x.md` to
content-root-absolute `/x.md` before Docusaurus resolves links, so a
relative link still resolves in the zh-Hans build when source and target
sit on different sides of the translation fallback (Docusaurus resolves
`./`/`../` only against the source file's own directory).
- website/README.md states the convention and points at the checker.
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