I built a 5-phase design system that turns "I have an app idea" into a TDD prompt

App Architect walks you from a one-line idea to a production-ready prompt — user flow, page map, system design, spec, and tests. Here's why I built it and how it works. Every developer has done this at least once: you have a vague idea, you open Claude or ChatGPT, you type "build me a habit tracker