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>

themes/README.md

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+# Themes
+
+Theme files override role tokens (`text.default`, `surface.*`, `border.*`)
+without touching the underlying palette. To add a theme, copy `light/theme.json`
+and supply your own values for each role token.
+
+| Theme | File | Use |
+|-------|------|-----|
+| Light | `light/theme.json` | Default product theme. |
+| Dark  | `dark/theme.json`  | Dimmed surfaces, reduced shadow weight. |
+| High Contrast | `high-contrast/theme.json` | Accessibility: 7:1+ contrast. |

themes/dark/theme.json

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+{
+  "name": "KDC Dark",
+  "colors": {
+    "surface.background": "#0B0D12",
+    "surface.subtle":     "#12151B",
+    "surface.muted":      "#1B1F27",
+    "text.default":       "#F7F8FA",
+    "text.muted":         "#B8BDC9",
+    "text.inverse":       "#111827",
+    "border.default":     "#2A2F3A",
+    "border.strong":      "#3A4150"
+  }
+}

themes/high-contrast/theme.json

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+{
+  "name": "KDC High Contrast",
+  "colors": {
+    "surface.background": "#000000",
+    "surface.subtle":     "#000000",
+    "surface.muted":      "#0A0A0A",
+    "text.default":       "#FFFFFF",
+    "text.muted":         "#EDEFF3",
+    "text.inverse":       "#000000",
+    "border.default":     "#FFFFFF",
+    "border.strong":      "#FFFFFF"
+  }
+}

themes/light/theme.json

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+{
+  "name": "KDC Light",
+  "colors": {
+    "surface.background": "#FFFFFF",
+    "surface.subtle":     "#F7F8FA",
+    "surface.muted":      "#EDEFF3",
+    "text.default":       "#111827",
+    "text.muted":         "#6B7280",
+    "text.inverse":       "#FFFFFF",
+    "border.default":     "#D9DCE3",
+    "border.strong":      "#B8BDC9"
+  }
+}