Create src/styles/tokens.css with complete design token system including:
- Surface, text, accent, code, border, focus colors
- State colors (success, warning, error, info)
- Shadow definitions
- Typography families with full fallback stacks
- Typography scale (xs through 3xl) and line heights
- Spacing scale (0 through 12)
- Border radius tokens
- Layout constraints (prose, code, container widths)
- Motion tokens with reduced-motion media query
All values sourced from .design/specs/design-tokens-2026-05-26.md.
Includes verification test with 56 assertions across all categories.
Ken