Generate design tokens in DTCG format

Generate and validate design tokens in DTCG format across three tiers

Generating multi-brand token systems with semantic-layer isolation and automated a11y validation.

• · CLAUDE.md token guidelines
• · existing tokens/colors.json, tokens/typography.json

• · DTCG tokens/*.json files with type and value

• · python3 scripts/validate_tokens.py
• · python3 scripts/contrast.py

Project with tokens/ directory and CLAUDE.md token system rules

validate_tokens.py fails on alias resolution, contrast check fails WCAG AA on new colors

• · scripts/validate_tokens.py checks all aliases
• · contrast.py enforces 4.5:1 on text, 3:1 on UI