Add public leaderboard site

Author: couragec

.github/workflows/leaderboard-pages.yml

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+name: Deploy leaderboard
+
+"on":
+  push:
+    branches:
+      - main
+    paths:
+      - "leaderboard/**"
+      - ".github/workflows/leaderboard-pages.yml"
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+concurrency:
+  group: pages
+  cancel-in-progress: false
+
+jobs:
+  deploy:
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Configure Pages
+        uses: actions/configure-pages@v5
+
+      - name: Upload artifact
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: leaderboard
+
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v4

leaderboard/.nojekyll

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+

leaderboard/README.md

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+# TwinRouterBench Leaderboard
+
+Static leaderboard site for GitHub Pages.
+
+## Local preview
+
+```bash
+cd leaderboard
+python3 -m http.server 8000
+```
+
+Open `http://127.0.0.1:8000/`.
+
+## GitHub Pages
+
+Use one of these deployment layouts:
+
+1. Point GitHub Pages at the `leaderboard/` directory if the repository UI allows it.
+2. Rename or copy this directory to `docs/` and select `main` / `docs` in GitHub Pages.
+3. Use a GitHub Actions workflow to publish `leaderboard/` to Pages.
+
+The site is fully static. Updating `data/leaderboard.json` updates the rendered table.