ci(superdoc): add Codecov coverage reporting (#2831)

* ci(superdoc): add Codecov coverage reporting

Adds a coverage job to ci-superdoc.yml that runs vitest with
v8 coverage on the superdoc package and uploads lcov to Codecov.
Minimal codecov.yml with auto project + patch targets.

* ci(superdoc): slim down coverage job

* ci(superdoc): build yjs-collaboration before coverage tests

* ci(superdoc): scope coverage to shipped src code

Move coverage include/exclude into packages/superdoc/vite.config.js
so local and CI agree on what counts. Excludes dev playground,
build scripts, and pure re-export entry points (index.js, main.js,
super-editor.js, headless-toolbar*.js). Coverage rises from
~64% to ~75% by measuring only code we ship.

* ci(superdoc): exclude jsdoc typedef files from coverage

Author: caio-pizzol

.github/workflows/ci-superdoc.yml

@@ -206,9 +206,34 @@ jobs:
       - name: Run CLI tests
         run: pnpm run test:cli
 
+  coverage:
+    needs: build
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+
+      - uses: pnpm/action-setup@v4
+
+      - uses: actions/setup-node@v6
+        with:
+          node-version-file: .nvmrc
+          cache: pnpm
+
+      - run: pnpm install
+
+      - run: pnpm --filter @superdoc-dev/superdoc-yjs-collaboration build
+
+      - run: pnpm --filter superdoc exec vitest run --coverage
+
+      - uses: codecov/codecov-action@v5
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
+          files: packages/superdoc/coverage/lcov.info
+          flags: superdoc
+
   validate:
     if: always()
-    needs: [build, unit-tests, cli-tests]
+    needs: [build, unit-tests, cli-tests, coverage]
     runs-on: ubuntu-latest
     steps:
       - name: Check results

codecov.yml

@@ -0,0 +1,10 @@
+coverage:
+  status:
+    project:
+      default:
+        target: auto
+        threshold: 1%
+    patch:
+      default:
+        target: auto
+        threshold: 1%

packages/superdoc/vite.config.js

@@ -167,6 +167,24 @@ export default defineConfig(({ mode, command }) => {
         '**/*.spec.js',
         'tests/umd-smoke/**',
       ],
+      coverage: {
+        provider: 'v8',
+        reporter: ['text-summary', 'lcov'],
+        include: ['src/**'],
+        exclude: [
+          'src/dev/**',
+          'src/index.js',
+          'src/main.js',
+          'src/types.ts',
+          'src/super-editor.js',
+          'src/headless-toolbar.js',
+          'src/headless-toolbar-react.js',
+          'src/headless-toolbar-vue.js',
+          // Pure JSDoc typedef files (body is `export {}`, no runtime code)
+          'src/core/types/**',
+          '**/types.js',
+        ],
+      },
     },
     build: {
       target: 'es2022',