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refs #173. This is the minimum step from the issue: the site is now **built** in CI, not **published**. Publishing still needs an ADR (Gitea has no built-in Pages) or a CLAUDE.md §12 correction, so the issue stays open. - `make docs`: creates a throwaway `.venv-docs`, installs pinned `mkdocs==1.6.1` and `mkdocs-material==9.7.7`, then runs `mkdocs build --strict`. The target is also added to `make ci`. - New `docs` job in `ci.yaml` (`setup-python@v5`, then `make docs`). - Red, then green: the first commit fails on a link from `runbooks/ci.md` to a file outside `docs/`; the second turns that link into plain code. **Dependency (§13):** mkdocs and mkdocs-material were already the site's declared toolchain (`mkdocs.yml`) but were never installed anywhere. They give a strict link/nav/theme check. Replacing them means writing our own Markdown link checker, and `check-docs-nav.py` already covers only the nav half. Risk: Material warns that MkDocs 2.0 drops its plugin/theme system, so both are pinned exactly. No ADR, since this adds no new decision beyond what `mkdocs.yml` already assumes. Verified locally: `make docs` → `Documentation built in 0.87 seconds`. 🤖 Generated with [Claude Code](https://claude.com/claude-code)Reviewed-on: #189