Add test coverage reporting

.github/workflows/ci.yml

@@ -39,3 +39,29 @@ jobs:
 
       - name: Build
         run: npm run build
+
+  coverage:
+    name: Coverage
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v5
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v5
+        with:
+          node-version: 22
+          cache: npm
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Run coverage
+        run: npm run test:coverage
+
+      - name: Upload coverage report
+        uses: actions/upload-artifact@v4
+        with:
+          name: coverage-report
+          path: coverage

.gitignore

@@ -7,6 +7,7 @@ node_modules/
 # Build outputs
 dist/
 release/
+coverage/
 
 # Logs
 *.log