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>

docs/principles/README.md

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+# Design Principles
+
+1. **Clarity over cleverness** — the obvious solution is the right one.
+2. **Consistency builds trust** — use system tokens, not bespoke values.
+3. **Accessibility is the floor** — WCAG 2.2 AA is the minimum, not a goal.
+4. **Whitespace is structural** — let layout breathe before adding rules.
+5. **Motion is feedback** — animation explains state change, never decorates.