Closed token layer 3-tier, méthode Pandya (Atlaskit 418→0)
Pandya method to scale a design system in 3 strictly closed layers: (1) upstream DS tokens (raw values, full palettes), (2) project aliases with fallbacks (`color-action-primary` → `blue-500` with explicit fallback), (3) components reference ONLY layer 2. Documented Atlaskit case: 418 hardcoded values → 0. Difference vs standard `three-tier-tokens`: directionality is ENFORCED by CI audit script, not just documented.