ci: github pages and CI workflows

Add a Pages deployment workflow that publishes web/ on every push to
main with the contents/pages/id-token permissions and a pages
concurrency group that cancels in-progress runs. Add a CI workflow
that installs deps and runs node --check on every JS file under src/
plus validates the service worker and manifest in web/.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: DavidLiedle

.github/workflows/ci.yml

@@ -0,0 +1,40 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+          cache: 'npm'
+
+      - name: Install dependencies
+        run: npm install --ignore-scripts
+
+      - name: Syntax-check src/ JavaScript
+        run: |
+          shopt -s globstar nullglob
+          failed=0
+          for f in src/**/*.js; do
+            echo "node --check $f"
+            node --check "$f" || failed=1
+          done
+          exit $failed
+        shell: bash
+
+      - name: Syntax-check web/sw.js
+        run: node --check web/sw.js
+
+      - name: Validate web/manifest.json
+        run: node -e "JSON.parse(require('fs').readFileSync('web/manifest.json','utf8'))"

.github/workflows/deploy-web.yml

@@ -0,0 +1,41 @@
+name: Deploy web demo to GitHub Pages
+
+on:
+  push:
+    branches: [main]
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+concurrency:
+  group: pages
+  cancel-in-progress: true
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Configure Pages
+        uses: actions/configure-pages@v5
+
+      - name: Upload web/ as Pages artifact
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: web
+
+  deploy:
+    needs: build
+    runs-on: ubuntu-latest
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    steps:
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v4