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/README.md

@@ -0,0 +1,8 @@
+# Foundations · Colors
+
+Reference documentation for the **colors** foundation. The canonical token values
+live in [`../../design.md`](../../design.md) and the machine-readable export
+in [`../../tokens/`](../../tokens/).
+
+This page is for human-facing rationale: when to use which token, examples,
+and platform notes.