[codex] prepare v2.1.0 release

.github/workflows/ci.yml

@@ -0,0 +1,47 @@
+name: CI
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+
+permissions:
+  contents: read
+
+jobs:
+  test:
+    name: Node ${{ matrix.node-version }}
+    runs-on: ubuntu-latest
+
+    strategy:
+      fail-fast: false
+      matrix:
+        node-version:
+          - 20
+          - 22
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Node
+        uses: actions/setup-node@v4
+        with:
+          node-version: ${{ matrix.node-version }}
+          cache: npm
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Typecheck and unit tests with coverage
+        run: npm run coverage -- --runInBand
+
+      - name: Build distributables
+        run: npm run build
+
+      - name: Test distributable bundle
+        run: npm run test:dist -- --runInBand
+
+      - name: Verify npm package contents
+        run: npm pack --dry-run