Framework-neutral IBM Carbon Design System foundations. Use when adopting Carbon's principles, type scale, spacing, color, density, accessibility, or content guidance in a project that does NOT install `@carbon/*` packages — Tailwind, Mantine, Chakra, vanilla CSS, custom design system, or Figma audit. Use for "Carbon-inspired", "feels like Carbon", or "Carbon-aligned" without packages. Skip if the project imports any `@carbon/*` package — defer to the package-specific skill.
