docs(bf-5ec): document Cloudflare Pages deployment completion

- Cloudflare Pages site successfully deployed to https://ai-code-battle.pages.dev
- GitHub Actions workflow completed successfully (123 files uploaded)
- GitHub secrets (CLOUDFLARE_API_TOKEN, CLOUDFLARE_ACCOUNT_ID) already configured
- Custom domain aicodebattle.com still NXDOMAIN - needs domain registration and Cloudflare DNS setup
- R2 bucket setup may be needed for replay storage (backend requirement)

Co-Authored-By: Claude <noreply@anthropic.com>

notes/bf-5ec.md

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+# Cloudflare Pages Deployment - bf-5ec
+
+## Completed ✅
+
+1. **Cloudflare Pages site deployed successfully**
+   - GitHub Actions workflow triggered and completed successfully
+   - Site accessible at: https://ai-code-battle.pages.dev
+   - Deployment uploaded 123 files to Cloudflare Pages
+   - Production URL: https://15fb8194.ai-code-battle.pages.dev
+   - Branch alias: https://master.ai-code-battle.pages.dev
+
+2. **GitHub Secrets configured** (already existed)
+   - `CLOUDFLARE_API_TOKEN` - configured
+   - `CLOUDFLARE_ACCOUNT_ID` - configured
+
+3. **Web build working**
+   - `web/dist/` contains 123 files
+   - Vite build output ready for deployment
+
+## Remaining Tasks ⚠️
+
+### Custom Domain Setup
+- **aicodebattle.com is currently NXDOMAIN** (domain does not exist)
+- To enable the custom domain, you need to:
+  1. **Register the domain** `aicodebattle.com` if not already registered
+  2. **Add domain to Cloudflare** and set up DNS
+  3. **Configure custom domain in Cloudflare Pages**:
+     - Go to Cloudflare dashboard → Pages → ai-code-battle
+     - Click "Custom domains" → "Set up a custom domain"
+     - Add `aicodebattle.com`
+     - Update DNS records as directed by Cloudflare
+
+### R2 Bucket Setup
+- R2 bucket may be needed for storing replay files and other assets
+- Check if this is required for the backend API (worker-api/)
+- The frontend deployment does not require R2 directly
+
+## Deployment Details
+
+**Workflow Run:** https://github.com/jedarden/ai-code-battle/actions/runs/28302871185
+**Status:** ✅ Success
+**Project:** ai-code-battle
+**Deployment Time:** ~49 seconds
+
+## Files Deployed
+- index.html (main app)
+- replay.html (replay viewer)
+- Various test HTML files
+- Static assets (img/, data/)
+- _headers (Cloudflare Headers)
+- robots.txt
+
+## Verification
+
+```bash
+# Check the deployed site
+curl https://ai-code-battle.pages.dev
+# Returns HTTP 200 with HTML content
+
+# Custom domain check
+curl https://aicodebattle.com
+# Currently fails (NXDOMAIN - domain not registered/configured)
+```
+
+## Next Steps
+
+1. **Register domain** `aicodebattle.com` (if not already owned)
+2. **Add to Cloudflare** and configure DNS
+3. **Set up custom domain** in Cloudflare Pages dashboard
+4. **Verify R2 bucket** requirements for replay storage (check worker-api/)
+
+## Notes
+
+- The GitHub Actions deployment is now automated and will redeploy on pushes to `master` branch
+- Wrangler configuration is correct (wrangler.toml)
+- Manual deployment available via: `cd web && npm run build && wrangler pages deploy dist --project-name=ai-code-battle`