Feat: Add workflow to prune stale test results

.github/workflows/cleanup-tests.yml

@@ -0,0 +1,30 @@
+name: Cleanup Stale Tests
+
+on:
+  workflow_dispatch:
+  schedule:
+    - cron: '0 0 * * 0' # Weekly
+
+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-results.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 results.json
+          git diff --staged --quiet || (git commit -m "Chore: Remove stale test results" && git push)