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>

tokens/typography.json

@@ -0,0 +1,14 @@
+{
+  "typography": {
+    "display":    { "fontFamily": "Inter", "fontSize": "48px", "fontWeight": 700, "lineHeight": "56px", "letterSpacing": "-0.02em" },
+    "headingXL":  { "fontFamily": "Inter", "fontSize": "32px", "fontWeight": 700, "lineHeight": "40px" },
+    "headingL":   { "fontFamily": "Inter", "fontSize": "24px", "fontWeight": 600, "lineHeight": "32px" },
+    "headingM":   { "fontFamily": "Inter", "fontSize": "20px", "fontWeight": 600, "lineHeight": "28px" },
+    "headingS":   { "fontFamily": "Inter", "fontSize": "16px", "fontWeight": 600, "lineHeight": "24px" },
+    "bodyL":      { "fontFamily": "Inter", "fontSize": "18px", "fontWeight": 400, "lineHeight": "28px" },
+    "bodyM":      { "fontFamily": "Inter", "fontSize": "16px", "fontWeight": 400, "lineHeight": "24px" },
+    "bodyS":      { "fontFamily": "Inter", "fontSize": "14px", "fontWeight": 400, "lineHeight": "20px" },
+    "caption":    { "fontFamily": "Inter", "fontSize": "12px", "fontWeight": 500, "lineHeight": "16px", "letterSpacing": "0.02em" },
+    "mono":       { "fontFamily": "Roboto Mono", "fontSize": "14px", "fontWeight": 400, "lineHeight": "20px" }
+  }
+}