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>

tokens/elevation.json

@@ -1,9 +1,11 @@
 {
+  "$description": "Ink-tinted shadow scale (rgb 26 21 48 = brand.ink). Matches the surveyadd / vault / void product family.",
   "elevation": {
     "0": { "shadow": "none" },
-    "1": { "shadow": "0 1px 2px rgba(17,24,39,0.06)" },
-    "2": { "shadow": "0 4px 12px rgba(17,24,39,0.10)" },
-    "3": { "shadow": "0 16px 32px rgba(17,24,39,0.16)" },
-    "4": { "shadow": "0 24px 48px rgba(17,24,39,0.20)" }
+    "1": { "shadow": "0 1px 2px rgba(26,21,48,0.04)" },
+    "2": { "shadow": "0 4px 12px -4px rgba(26,21,48,0.08)" },
+    "3": { "shadow": "0 16px 40px -16px rgba(26,21,48,0.18)" },
+    "4": { "shadow": "0 24px 80px -24px rgba(26,21,48,0.22)" },
+    "focus-ring": { "shadow": "0 0 0 3px rgba(107,53,167,0.18)", "$description": "Primary focus halo. Use on any focusable element." }
   }
 }