[ci] Merge ESLint and Prettier workflows with auto-fix

- Combines separate eslint.yaml and format.yaml into unified lint-and-format.yaml
- Automatically fixes ESLint and Prettier issues on PRs and commits changes
- Adds GitHub Action permissions for content write to enable auto-commits
- Includes PR commenting to notify when auto-fixes are applied
- Enables faster iteration by eliminating manual fix cycles

.github/workflows/lint-and-format.yaml

@@ -0,0 +1,71 @@
+name: Lint and Format
+
+on:
+  pull_request:
+    branches-ignore: [ wip/*, draft/*, temp/* ]
+
+permissions:
+  contents: write
+  pull-requests: write
+
+jobs:
+  lint-and-format:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout PR
+        uses: actions/checkout@v4
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          ref: ${{ github.head_ref }}
+          fetch-depth: 0
+
+      - name: Use Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 'lts/*'
+          cache: 'npm'
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Run ESLint with auto-fix
+        run: npm run lint:fix
+
+      - name: Run Prettier with auto-format
+        run: npm run format
+
+      - name: Check for changes
+        id: verify-changed-files
+        run: |
+          if [ -n "$(git status --porcelain)" ]; then
+            echo "changed=true" >> $GITHUB_OUTPUT
+          else
+            echo "changed=false" >> $GITHUB_OUTPUT  
+          fi
+
+      - name: Commit changes
+        if: steps.verify-changed-files.outputs.changed == 'true'
+        run: |
+          git config --local user.email "[email protected]"
+          git config --local user.name "GitHub Action"
+          git add .
+          git commit -m "[auto-fix] Apply ESLint and Prettier fixes"
+          git push
+
+      - name: Comment on PR
+        if: steps.verify-changed-files.outputs.changed == 'true'
+        uses: actions/github-script@v7
+        with:
+          script: |
+            github.rest.issues.createComment({
+              issue_number: context.issue.number,
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              body: '✅ **Auto-fix Applied**\n\nESLint and Prettier have automatically fixed formatting and linting issues in this PR. The changes have been committed to this branch.'
+            })
+
+      - name: Run final lint check
+        run: npm run lint
+
+      - name: Run final format check  
+        run: npm run format:check