I ran Opus 5 for two hours to recreate Sakura Crossing as an explorable Three.js version of San Francisco. I had Codex use the Claude Code CLI, so the two agents worked on the same build. The whole site is packaged as a single HTML file. Three.js site: https://sf-city.mengto.chatgpt.site Original repo: https://github.com/Kenton-GMI/sakura-cro…