Feat: Action to trigger stale output cleanup

.github/workflows/cleanup-stale-outputs.yml

@@ -0,0 +1,31 @@
+name: Cleanup Stale Outputs
+
+on:
+  workflow_dispatch:
+  push:
+    paths:
+      - 'README'
+
+jobs:
+  cleanup:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+
+      - name: Run cleanup script
+        run: node scripts/cleanup-outputs.js
+
+      - name: Commit and push if changed
+        run: |
+          git config --global user.name 'github-actions[bot]'
+          git config --global user.email 'github-actions[bot]@users.noreply.github.com'
+          git add tests
+          git diff --staged --quiet || (git commit -m "Refactor: Remove stale benchmark outputs" && git push)