ci: add GitHub Actions workflow for build + MCP introspection smoke test

Author: ratamaha-git

.github/workflows/ci.yml

@@ -0,0 +1,32 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+          cache: 'npm'
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Build
+        run: npm run build
+
+      - name: MCP introspection smoke test
+        run: |
+          echo '{"jsonrpc":"2.0","id":1,"method":"initialize","params":{"protocolVersion":"2024-11-05","capabilities":{},"clientInfo":{"name":"ci","version":"0"}}}' \
+            | timeout 10 node dist/index.js 2>/dev/null \
+            | grep -q '"result"' && echo "introspection OK" || (echo "introspection FAILED" && exit 1)