State Machine skill: what it does and how to install it

What it does. Inspects one component and its data paths to list reachable data, account and feature states. It builds a temporary app route using the real component, product-shaped fixtures at the data boundary, and a grouped __state switcher, then checks every state and hands over the URL and keys.

When to use it. Use it to work through one component's visuals across its implemented states. It is not a finished-work review, an alternative-design exercise, or a way to show branches the code cannot reach.