Review a pharos-tokens PR

Checklist ordered by priority. If any of the first five items fail, the PR does not merge without correction.

1. DTCG format

• Every token has $value, $type, $description.
• $type matches the value (e.g. color for OKLCH strings, dimension for rem/px, duration for ms).
• The DTCG .tokens.json files parse without errors (valid JSON).

2. Naming

• Token path follows the existing hierarchy (color.{neutral,primary,semantic.*,base}, spacing.*, radius.*, font.*, shadow.*, z.*, duration.*, easing.*).
• Numeric scale for colors (50..900 or 50..950) or clear semantic (fg/bg/on).
• The CSS var output is prefixed with --pharos-* (automatically validated by the CSS output test).

3. Colors: format and contrast