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>

scripts/README.md

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+# Scripts
+
+Build / export tooling for the design system.
+
+| Script | Purpose |
+|--------|---------|
+| `build-tokens.js` | Convert `tokens/*.json` into platform outputs. |

scripts/build-tokens.js

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+#!/usr/bin/env node
+/**
+ * KDC Design System — token build script (placeholder).
+ *
+ * Reads tokens/*.json and emits platform-specific outputs:
+ *   - dist/tokens.css  (CSS custom properties)
+ *   - dist/tokens.scss (Sass variables)
+ *   - dist/tokens.ts   (TypeScript constants)
+ *
+ * Replace this stub with a real implementation (e.g. Style Dictionary).
+ */
+console.log("[kds] build-tokens: not implemented yet");