Add Dependabot configuration and CI workflow

.github/dependabot.yml

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+# This is the dependabot configuration file that automates dependency updates
+# Updates section configures how dependabot should handle dependency updates:
+#
+# - Monitors NPM dependencies in the root directory
+# - Checks for updates weekly
+# - Groups updates based on their type (dev grouped by minor/patch or prod grouped by patch)
+#
+# - Monitors GitHub Actions dependencies in the root directory
+# - Checks for updates weekly
+#
+# Learn more at https://docs.github.com/en/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file#configuration-options-for-the-dependabotyml-file
+version: 2
+updates:
+  - package-ecosystem: npm
+    directory: /
+    schedule:
+      interval: weekly
+    groups:
+      npm-development:
+        dependency-type: development
+        update-types:
+          - minor
+          - patch
+      npm-production:
+        dependency-type: production
+        update-types:
+          - patch
+  - package-ecosystem: github-actions
+    directory: /
+    schedule:
+      interval: weekly

.github/workflows/ci.yml

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+name: CI
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version: [22.x, 24.x]
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
+
+    - name: Setup Node.js ${{ matrix.node-version }}
+      uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020
+      with:
+        node-version: ${{ matrix.node-version }}
+        cache: 'npm'
+
+    - name: Install dependencies
+      run: npm ci
+
+    - name: Run tests
+      run: npm test