update

Co-authored-by: Copilot <copilot@github.com>

.github/workflows/ci.yml

@@ -25,6 +25,12 @@ jobs:
       - name: Lint
         run: ruff check .
 
+      - name: Lint Markdown
+        run: mdformat --check README.md ROADMAP.md CHANGELOG.md
+
+      - name: Lint YAML
+        run: yamllint .
+
       - name: Type-check
         run: mypy src