Add GitHub Pages deploy workflow

Deploys the repo root (index.html) to GitHub Pages on every push to main.
configure-pages runs with enablement:true so the Pages site is created
automatically on first run — no manual settings step needed.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LJUuoQXWUkMk2YSxRM2MSp

Author: claude

.github/workflows/pages.yml

@@ -0,0 +1,32 @@
+name: Deploy to GitHub Pages
+
+on:
+  push:
+    branches: [main]
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+concurrency:
+  group: pages
+  cancel-in-progress: true
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/configure-pages@v5
+        with:
+          enablement: true
+      - uses: actions/upload-pages-artifact@v3
+        with:
+          path: .
+      - id: deployment
+        uses: actions/deploy-pages@v4