Build a clickable static HTML prototype of one or two screens and keep it in the repo under qstack/compound_engineering/prototypes/<slug>/, or attach it to a QStack plan, where it is embedded in plan.html through an iframe with a link to open it in its own tab. Works from a brief in the conversation, a design doc, or an existing screen in the code. No framework, no build, no network. Use when invoked as /qstack-ui-prototype, when asked for a prototype, mockup, or wireframe that should be kept, or automatically from /qstack-plan-to-html when the plan changes something a person will look at.
