feat: design system v1.0.0 — reconcile tokens from cross-repo audit

Extracted real production usage from 8 KDC repos and consolidated the
consensus (kdcsurveyadd / kdcvault / kdc_void_planner) into the canonical
design.md + tokens.

Highlights:
- brand.ink #000000 -> #1A1530 (purple-tinted, matches real usage)
- brand.canvas #F5F4F0 -> #F7F4ED (warm)
- neutral ramp rebuilt around ink (purple-tinted, not cold slate)
- semantic palette retuned for warm canvas + soft tints
- elevation shadows retinted with brand-ink rgb
- new accent.gold (product) and accent.mint (marketing) tokens
- real themes/light, themes/dark, themes/high-contrast
- fleshed out every component + foundation README
- docs/consolidation-2026-05.md captures the full audit + drift inventory

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

foundations/radius/README.md

@@ -1,8 +1,28 @@
 # Foundations · Radius
 
-Reference documentation for the **radius** foundation. The canonical token values
-live in [`../../design.md`](../../design.md) and the machine-readable export
-in [`../../tokens/`](../../tokens/).
+Corner radius scales with component density. Pick from the curated set — never hand-roll a value.
 
-This page is for human-facing rationale: when to use which token, examples,
-and platform notes.
+## Scale
+
+| Token | px | Use |
+|-------|-----|-----|
+| `none` | 0    | Resets, full-bleed images |
+| `xs`   | 2    | Chips, inline tags |
+| `sm`   | 4    | Inputs, small controls, tooltips |
+| `md`   | 8    | Buttons, default surfaces |
+| `lg`   | 12   | Cards, sections |
+| `xl`   | 16   | Modals, sheets, elevated cards |
+| `2xl`  | 24   | Marketing surfaces, feature panels |
+| `full` | 9999 | Pills, avatars, badges, circular buttons |
+
+## Rules
+
+- ✅ Match radius to size: small controls get `sm`, big surfaces get `lg`/`xl`. A 600px modal at `rounded.sm` looks broken.
+- ✅ Nested radii — the inner radius should be `outer - padding` to keep the corner concentric. Most of the time `lg` outside + `md` inside reads right.
+- ❌ Don't mix more than two radii in a single composition.
+- ❌ Don't use `full` on anything taller than 32px unless it's intentionally circular.
+
+## Per-platform notes
+
+- iOS: Apple's continuous corners are not directly available in CSS — accept the small perceptual difference rather than approximating.
+- Tailwind v4: bind these to `--radius-{token}` in `@theme`, e.g. `--radius-md: 8px`. The product family does this in `globals.css`.