prd-v04-visual-prototype-gate

Generate visual prototype prompts from SCR — entries for Google Stitch (or equivalent UI generation tool). Triggers on: 'make a prototype', 'visualize screens', 'generate Stitch prompt', 'I need a visual demo', 'prototype the workflow', 'show me what this looks like', 'get this to a demo', 'visual gate'. Consumes SCR — (Screen Flow Definition), PER — (Personas), UJ — (User Journeys), DES — (Design Components).…