chore: initial scaffold of KDC Design System

Initial repository scaffold:
- design.md (google-labs-code/design.md format) as canonical token + guidelines source
- brand assets, foundations, tokens (W3C-style JSON)
- 12 component primitives, each with labeled anatomy.svg and spec README
- light / dark / high-contrast themes, web/mobile/email/print/presentation templates
- docs (getting started, principles, a11y, voice & tone, contributing)
- runnable web example, token build script stub, CI placeholder

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

foundations/colors/swatches.md

@@ -0,0 +1,13 @@
+# Color Swatches
+
+| Token | Hex | Preview |
+|-------|-----|---------|
+| `brand.primary`         | `#0B5FFF` | 🟦 |
+| `brand.secondary`       | `#FF6B00` | 🟧 |
+| `brand.accent`          | `#00C2A8` | 🟩 |
+| `neutral.0`             | `#FFFFFF` | ⬜ |
+| `neutral.900`           | `#111827` | ⬛ |
+| `semantic.success`      | `#16A34A` | ✅ |
+| `semantic.warning`      | `#F59E0B` | ⚠️  |
+| `semantic.danger`       | `#DC2626` | 🛑 |
+| `semantic.info`         | `#0EA5E9` | ℹ️  |