ci: add comprehensive GitHub Actions workflow

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.github/workflows/style.yml

@@ -0,0 +1,42 @@
+name: style
+
+on:
+  push:
+    branches: [master, main]
+    tags: ["v*"]
+  pull_request:
+
+permissions:
+  contents: write
+
+jobs:
+  style:
+    name: style
+    runs-on: ubuntu-latest
+    environment: style
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+          cache: 'npm'
+
+      - run: npm ci
+
+      - name: Run eslint fix
+        run: npm run lint:fix || npm run lint -- --fix || true
+
+      - name: Commit changes
+        run: |
+          git config user.name "github-actions[bot]"
+          git config user.email "github-actions[bot]@users.noreply.github.com"
+          git add -A
+          if git diff --staged --quiet; then
+            echo "No changes to commit"
+          else
+            git commit -m "style: auto-fix eslint warnings [skip ci]"
+            git push
+          fi