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Copilot flagged two stragglers on editors.md where the previous file-by-file conversion stopped halfway. Sweeping for the same pattern across the active content tree found 76 bare relative internal links total — 14 in this PR's already-modified files (Copilot's two plus twelve more) and 62 in unchanged files. Why the build doesn't catch this ───────────────────────────────── `onBrokenLinks: 'throw'` (set in this PR) only validates *file-based* markdown references — links whose URL ends in `.md` / `.mdx`. Those go through Docusaurus's file resolver, which can prove the target exists. Bare relative URL paths like `[Foo](../foo)` skip that resolver entirely; Docusaurus emits them as raw hrefs. The browser then resolves them against the *current* page URL, and for trailing-slash routes that almost always lands in the wrong directory. Page navigates client-side and 404s. The linkinator job in CI *can* catch these, but it's `continue-on-error: true` so findings are advisory. What this commit does ────────────────────── 1. Fix all 76 bare relative internal links across the active docs tree by appending `.md` to each one (preserving anchors / query strings). All 76 targets resolved to real files; no link targets changed, only the form of the reference. 2. Fix the component-page generator. 54 of the 76 bare links lived in two auto-generated index files (`components/ui/index.mdx` and `components/design-system/index.mdx`). The next regeneration would have undone the manual fixes without this. The two emission sites in `generate-superset-components.mjs` now emit `.md`-suffixed links; comment at the call site explains why. 3. Add `docs/scripts/lint-docs-links.mjs` — fast source-level linter that scans `.md`/`.mdx` files under the active content trees (skipping `versioned_docs/` snapshots) and fails if it finds any markdown link whose URL starts with `./` or `../` and does not end in `.md`/`.mdx`. Excludes asset paths (.png, .json, etc.) and ignores fenced code blocks. Wired up as `yarn lint:docs-links`. 4. Add a `Lint docs links` step to `superset-docs-verify.yml`, running before the build step so PRs that introduce the pattern fail in seconds rather than at build-time / not at all. Blocking, not advisory — exactly the gap linkinator's `continue-on-error` leaves open. Verified ──────── - `yarn lint:docs-links` exits 0 on the cleaned tree - Re-introducing one bare link makes the linter report the exact file:line with the offending URL, exit code 1 - All 76 originally-flagged targets resolved to real `.md` / `.mdx` files; only the form of the reference changed