ci: Add GitHub Action to verify Notebook MCP bundle (#12)

Co-authored-by: snehshah22 <snehshah22@users.noreply.github.com>

Author: snehshah22

.github/workflows/notebook-mcp-check.yml

@@ -0,0 +1,43 @@
+# Copyright 2026 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+name: Notebook MCP Bundle Check
+
+on:
+  pull_request:
+    paths:
+      - 'notebook_mcp/**'
+
+jobs:
+  check-bundle:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out code
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
+
+      - name: Set up Node.js
+        uses: actions/setup-node@64745409647f540ba9c1a129988bd580887fb902 # v4
+        with:
+          node-version: '20'
+
+      - name: Install dependencies
+        run: npm install
+        working-directory: notebook_mcp
+
+      - name: Build bundle
+        run: npm run bundle
+        working-directory: notebook_mcp
+
+      - name: Check for uncommitted changes in bundle
+        run: git diff --exit-code notebook_mcp/dist/index.js