Agent Skills: ticket-prototype

Owns the prototyping sub-activity of Q↔R per QRDSPIV. Invoked from ticket-grill (and any future grill-adopting agent) when the gap being explored requires running throwaway code to answer it. Two branches: LOGIC (terminal/minimal runnable for state or business-logic questions) and UI (visual variants for layout/flow/interaction; uses the project's design system if one exists). Prototype code lives at {shared_folder}/tickets/{slug}/prototypes/{name}/; findings are returned to the caller for inclusion in the bundle's research file. Per QRDSPIV: throwaway from day one, one command to run, no persistence by default, skip polish, surface state.