Commit CI workflow: build, test, and demo on Node 20/22 with bundled sample artifacts

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Author: HelloThisWorld

.github/workflows/ci.yml

@@ -0,0 +1,35 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+
+# This repo is independently testable: the bundled sample artifacts are real
+# Open Mind output checked into examples/, so CI never checks out open-mind.
+jobs:
+  build-test-demo:
+    name: Build, test, and demo (Node ${{ matrix.node }})
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        node: [20, 22]
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: ${{ matrix.node }}
+          cache: npm
+
+      - name: Install
+        run: npm ci
+
+      - name: Build
+        run: npm run build
+
+      - name: Test
+        run: npm test
+
+      - name: Run the demo with bundled sample artifacts
+        run: npm run demo