ci: publish live benchmark dashboard to GitHub Pages

A pages workflow generates the GPU-free dummy-vs-remote comparison dashboard on
every push to main and deploys it to GitHub Pages, giving a permanent public
"evidence" link. README gets a benchmark badge + the dashboard URL.

Author: rsasaki0109

.github/workflows/pages.yml

@@ -0,0 +1,47 @@
+name: pages
+
+# Publish a live benchmark dashboard (GPU-free: dummy vs remote-over-HTTP) to
+# GitHub Pages on every push to main. Evidence, not vibes.
+
+on:
+  push:
+    branches: [main]
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+concurrency:
+  group: pages
+  cancel-in-progress: true
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+      - run: python -m pip install --upgrade pip numpy
+      - name: Generate benchmark dashboard
+        working-directory: world_model_py
+        run: |
+          mkdir -p ../_site
+          python -m world_model_py.cli bench-compare \
+            --adapters dummy,remote --runs 300 --out ../_site/index.html
+      - uses: actions/upload-pages-artifact@v3
+        with:
+          path: _site
+
+  deploy:
+    needs: build
+    runs-on: ubuntu-latest
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    steps:
+      - id: deployment
+        uses: actions/deploy-pages@v4

README.md

@@ -3,6 +3,7 @@
 [![ci](https://github.com/rsasaki0109/worldmodels_ros2/actions/workflows/ci.yml/badge.svg)](https://github.com/rsasaki0109/worldmodels_ros2/actions/workflows/ci.yml)
 [![license](https://img.shields.io/badge/license-Apache--2.0-blue.svg)](LICENSE)
 [![ROS 2](https://img.shields.io/badge/ROS%202-Jazzy-22314E.svg)](https://docs.ros.org/en/jazzy/)
+[![benchmark](https://img.shields.io/badge/benchmark-live-3b82f6.svg)](https://rsasaki0109.github.io/worldmodels_ros2/)
 
 **A ROS 2-native runtime, adapter hub, benchmark and visualization layer for
 using *existing* World Models in robotics and autonomous driving.**
@@ -69,6 +70,9 @@ python -m world_model_py.cli bench-compare --adapters dummy,remote --out compare
 #    remote adapter's HTTP overhead (e.g. dummy ~0.6ms vs remote ~11ms p50)
 ```
 
+A live version of this dashboard is published to GitHub Pages on every push:
+**<https://rsasaki0109.github.io/worldmodels_ros2/>**.
+
 ### 2. ROS 2 runtime
 
 ```bash