prototype

Build throwaway code that answers one design question that talk cannot settle. `logic` builds a self-contained HTML demo in docs/prototypes/ that drives a pure state module through free-play buttons and guided walkthroughs. `ui` builds 3–5 structurally different variants on an existing route behind `?variant=`, with a floating switcher, on a `prototype/<slug>` branch. `page` serves the demo, or a desktop and phone screenshot comparison of the variants, on the LAN. The answer goes into a short ADR (or into the proposed ADR of the `design` run that asked), the UI variants are deleted, and it offers `/delegate` for the proper build. Never commits. User-invoked only, through "/prototype".