ci: add code linting step to CI workflow

- Add Biome linting check before type checking
- Ensures code style and quality standards are enforced in CI
- Runs on all Node.js versions in the test matrix

Author: Mearman

.github/workflows/ci.yml

@@ -41,6 +41,9 @@ jobs:
         run: |
           npx commitlint --from ${{ github.event.pull_request.base.sha }} --to ${{ github.event.pull_request.head.sha }}
 
+      - name: Lint code
+        run: yarn lint
+
       - name: Type check
         run: npx tsc --noEmit