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>

README.md

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+# KDC Design System
+
+The official design system for KDC — tokens, components, brand assets, and guidelines for building consistent KDC product and brand experiences.
+
+> The single source of truth lives in [`design.md`](./design.md), which encodes the design tokens (colors, typography, spacing, radii, components) in the [google-labs-code/design.md](https://github.com/google-labs-code/design.md) format.
+
+## Repository structure
+
+```
+KDCDesignSystem/
+├── design.md                  # Canonical token + guidelines spec
+├── brand/                     # Logos, wordmarks, brand guidelines
+├── tokens/                    # Generated/exported design tokens
+├── foundations/               # Color, type, spacing, motion, grid, breakpoints
+├── assets/                    # Fonts, icons, illustrations, images, patterns
+├── components/                # Per-component specs and anatomy
+├── themes/                    # Light, dark, high-contrast theme overrides
+├── templates/                 # Web, mobile, email, print, presentation
+├── docs/                      # Getting started, principles, a11y, voice & tone
+├── examples/                  # Reference implementations
+└── scripts/                   # Token build / export scripts
+```
+
+## Quick start
+
+1. Read [`docs/getting-started/README.md`](./docs/getting-started/README.md).
+2. Skim [`design.md`](./design.md) for the token vocabulary.
+3. Pick your platform under [`examples/`](./examples/).
+
+## Status
+
+Version: **alpha**. Tokens and components are still settling — expect breaking changes.
+
+## Contributing
+
+See [`docs/contributing/README.md`](./docs/contributing/README.md).