Generate a Claude Code prompt that builds a content-driven mobile app to a polished v1, using the design spec from Stage 2 and the idea from Stage 1. This is Stage 3 of the claude-app-pipeline. Use this skill whenever the user wants to turn a design/prototype into actual built code. Trigger on phrases like "build prompt", "claude code prompt for app", "implement the app", "code the prototype", "build my app", "next step after design", "make a build prompt", "turn my design into code", or any similar request. Do not build the app yourself — this skill produces the PROMPT the user runs in Claude Code.
