devops: add test and npm publish workflows

.github/workflows/ci.yml

@@ -0,0 +1,26 @@
+name: CI
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  test:
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, macos-15, windows-latest]
+    runs-on: ${{ matrix.os }}
+    steps:
+    - uses: actions/checkout@v4
+    - name: Use Node.js 20
+      uses: actions/setup-node@v4
+      with:
+        node-version: '20'
+        cache: 'npm'
+    - name: Install dependencies
+      run: npm ci
+    - name: Run tests
+      run: npm run test

.github/workflows/publish.yml

@@ -0,0 +1,23 @@
+name: Publish
+on:
+  workflow_dispatch:
+  release:
+    types: [published]
+
+jobs:
+  publish-npm:
+    if: github.event_name == 'release'
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      id-token: write  # Required for OIDC npm publishing
+    steps:
+      - uses: actions/checkout@v5
+      - uses: actions/setup-node@v5
+        with:
+          node-version: 20
+          registry-url: https://registry.npmjs.org/
+      # Ensure npm 11.5.1 or later is installed (for OIDC npm publishing)
+      - run: npm install -g npm@latest
+      - run: npm ci
+      - run: npm publish

.gitignore

@@ -1,4 +1,5 @@
 node_modules/
 .claude/
 .vscode/
-/test-results/
+/test-results/
+/.playwright-cli/