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/spacing.json

@@ -0,0 +1,17 @@
+{
+  "spacing": {
+    "0":  "0px",
+    "1":  "4px",
+    "2":  "8px",
+    "3":  "12px",
+    "4":  "16px",
+    "5":  "20px",
+    "6":  "24px",
+    "8":  "32px",
+    "10": "40px",
+    "12": "48px",
+    "16": "64px",
+    "20": "80px",
+    "24": "96px"
+  }
+}