Agent Skills: sfnext-create-vertical

Create a new Storefront Next vertical (brand theme / storefront variant) by editing brand design tokens, typography, dark mode, and the Figma kit. Use when asked to create a new vertical, brand, theme, or storefront variant, re-skin the storefront, or change the brand palette. Covers the brand.css token layer, semantic token rules, fixture-based local development, and the extension-vs-base decision. NOT for engineering component patterns — see sfnext-components.