run tests against qdk samples

.github/workflows/ci.yml

@@ -40,3 +40,35 @@ jobs:
 
       - name: Run tests
         run: npm test
+
+  # Tokenizes the official Q# samples from a pinned QDK release and fails if
+  # any of them produce `invalid` / `illegal` scopes. Bump QDK_REF to test
+  # against a newer language surface.
+  corpus:
+    runs-on: ubuntu-latest
+    env:
+      QDK_REF: v1.29.0
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Check out the QDK samples (pinned)
+        uses: actions/checkout@v4
+        with:
+          repository: microsoft/qdk
+          ref: ${{ env.QDK_REF }}
+          path: qdk
+          sparse-checkout: samples
+
+      - name: Use Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 20.x
+          cache: npm
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Run tests against the QDK ${{ env.QDK_REF }} samples
+        env:
+          QDK_SAMPLES: ${{ github.workspace }}/qdk/samples
+        run: npm test