How I built a 3D space simulator in one day with Claude (Three.js + shaders)

I'm not a graphics programmer. I had never written a GLSL shader. I'd heard of Three.js but never actually used it. One day later, aethelia.space exists — a browser-based 3D space simulator with 6 real star systems, 12 shader-rendered cosmic anomalies, moons orbiting planets, procedural textures, and ambient audio. I built it pair-programming with Claude (Anthropic's AI). This post is the honest technical story: what worked, what didn't, the architecture decisions I made, and the exact prompts t...