Agent Skills: polish

Runs the last pass over a functionally complete feature — pixel alignment, interaction and loading states, empty and error states, copy consistency, transition smoothness, and micro-details measured against the design system. Requires the work to be finished first; it refines, it never restructures. Use when the user asks for polish, finishing touches, a pre-launch review, or wants to go from good to great. To fix the underlying composition instead, use `layout`.