design-system

Works two ways:

1. Standalone — user runs /gsp:design-system for a quick workspace audit
2. Building block — /gsp:start invokes this in the background during project setup

Output is workspace-level (not project-scoped), so it's shared across all projects and only needs to run once per codebase state change. Re-runnable — overwrites previous output.

Output: .design/system/{STACK,COMPONENTS,TOKENS,CONVENTIONS,CONCERNS}.md