Build a clickable mockup from the plan

A written plan cannot express a focal point. It cannot express screen order, position, hierarchy, or whether a set of choices is complete. Those are exactly the things that go wrong, and no amount of re-reading the notes will find them — the client agrees to the words and then sees the screens and says something quite different.

This skill turns the plan into something they can look at, runs the review that surfaces the gap, and writes what it finds back into CodeSpring.

Where it sits in the chain:

cs-build-plan-app  or  cs-build-import-codebase        (map + notes exist)
        │
        ▼
   cs-build-ui-mockup   ← you are here
        │            build it, show it, feed corrections back
        ▼
  cs-build-create-prd → cs-build-create-tasks → cs-build-feature

Run it before the PRDs. A PRD generated from a plan nobody has seen just encodes the misunderstanding in more detail and makes it more expensive to undo.