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/colors.json

@@ -0,0 +1,29 @@
+{
+  "$schema": "https://design-tokens.github.io/community-group/format/",
+  "color": {
+    "brand": {
+      "primary":        { "$value": "#0B5FFF", "$type": "color" },
+      "primary-hover":  { "$value": "#0848C2", "$type": "color" },
+      "primary-pressed":{ "$value": "#063494", "$type": "color" },
+      "secondary":      { "$value": "#FF6B00", "$type": "color" },
+      "accent":         { "$value": "#00C2A8", "$type": "color" }
+    },
+    "neutral": {
+      "0":    { "$value": "#FFFFFF", "$type": "color" },
+      "50":   { "$value": "#F7F8FA", "$type": "color" },
+      "100":  { "$value": "#EDEFF3", "$type": "color" },
+      "200":  { "$value": "#D9DCE3", "$type": "color" },
+      "300":  { "$value": "#B8BDC9", "$type": "color" },
+      "500":  { "$value": "#6B7280", "$type": "color" },
+      "700":  { "$value": "#374151", "$type": "color" },
+      "900":  { "$value": "#111827", "$type": "color" },
+      "1000": { "$value": "#000000", "$type": "color" }
+    },
+    "semantic": {
+      "success": { "$value": "#16A34A", "$type": "color" },
+      "warning": { "$value": "#F59E0B", "$type": "color" },
+      "danger":  { "$value": "#DC2626", "$type": "color" },
+      "info":    { "$value": "#0EA5E9", "$type": "color" }
+    }
+  }
+}