@@ -0,0 +1,108 @@
+name: Deploy website (fast)
+
+# Fast path: builds and deploys ONLY the interactive website (no Lean build),
+# so https://statlean.github.io/website/ goes live in minutes. The doc-gen4
+# docs are pulled from the shared cache that the full `deploy.yml` workflow
+# populates; if that cache is empty (docs not built yet) the website still
+# deploys and /docs/ becomes available after the first full build.
+
+on:
+  workflow_dispatch:
+  push:
+    branches: [main]
+    paths:
+      - '.github/workflows/website.yml'
+
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+concurrency:
+  group: pages
+  cancel-in-progress: false
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    timeout-minutes: 30
+    steps:
+      - name: Checkout source repository (StatLean/Stat-Lean)
+        uses: actions/checkout@v4
+        with:
+          repository: StatLean/Stat-Lean
+          ref: main
+          fetch-depth: 1
+          path: src
+
+      - name: Restore docs cache (if a full build has run)
+        uses: actions/cache@v4
+        with:
+          path: site/docs
+          key: site-docs-${{ hashFiles('src/lean-toolchain', 'src/lakefile.lean', 'src/lake-manifest.json') }}
+          restore-keys: site-docs-
+
+      - name: Set up Node
+        uses: actions/setup-node@v4
+        with:
+          node-version: 20
+          cache: npm
+          cache-dependency-path: src/website/package-lock.json
+
+      - name: Build the website
+        working-directory: src/website
+        run: |
+          npm ci
+          npm run build
+
+      - name: Assemble GitHub Pages site
+        run: |
+          mkdir -p site/docs site/website
+          cp -r src/website/dist/* site/website/
+          touch site/.nojekyll
+          cat > site/index.html <<'EOF'
+          <!doctype html>
+          <html lang="en">
+            <head>
+              <meta charset="utf-8">
+              <meta name="viewport" content="width=device-width, initial-scale=1">
+              <title>Asymptotic Statistical Theory in Lean 4</title>
+              <meta http-equiv="refresh" content="0; url=./website/">
+              <link rel="canonical" href="./website/">
+              <style>
+                body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; max-width: 46rem; margin: 4rem auto; padding: 0 1.25rem; line-height: 1.6; color: #1b1b1b; }
+                h1 { font-size: 1.9rem; margin-bottom: 0.25rem; }
+                a { color: #b07414; }
+                .btn { display: inline-block; margin-top: 1rem; margin-right: 0.5rem; padding: 0.6rem 1.1rem; background: #1b1b1b; color: #fff; border-radius: 999px; text-decoration: none; }
+                .btn.alt { background: transparent; color: #1b1b1b; border: 1px solid #ccc; }
+                .muted { color: #555; }
+              </style>
+            </head>
+            <body>
+              <h1>Asymptotic Statistical Theory in Lean 4</h1>
+              <p class="muted">Redirecting to the Stat-Lean website&hellip;</p>
+              <p>
+                <a class="btn" href="./website/">Open the website &rarr;</a>
+                <a class="btn alt" href="./docs/">API documentation</a>
+              </p>
+              <p class="muted">Source:
+              <a href="https://github.com/StatLean/Stat-Lean">github.com/StatLean/Stat-Lean</a></p>
+            </body>
+          </html>
+          EOF
+
+      - name: Upload GitHub Pages artifact
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: site
+
+  deploy:
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    runs-on: ubuntu-latest
+    needs: build
+    steps:
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v4