gsp-brand-brief

Works two ways:

1. Routed — /gsp-start detects "new brand" intent and invokes this skill
2. Direct — user runs /gsp-brand-brief directly

This skill handles new brands only. For existing brands (evolve mode), /gsp-start routes to /gsp-brand-audit directly.

Input: Brand name (from args or asked) Output: .design/branding/{name}/ with BRIEF.md, STATE.md, config.json, ROADMAP.md Next: /gsp-brand-research