feat(brand): adopt official Kode brand guidelines

- Brand palette: purple #6B35A7 (primary), #000000 (ink), #FFFFFF, #F5F4F0 (canvas)
- Typography: Manrope (UI, 200-800) + Opificio Bold (wordmark/display); drop Inter
- design.md: add wordmarkSecondary token, new display scale (Opificio 72/80)
- foundations: refresh swatches and typography README to match guidelines
- assets/fonts: replace Inter folder with Manrope; add Opificio cuts (Bold/Rounded/Regular)
- fonts.css: register Manrope variable + Opificio cuts; keep Roboto Mono for code only
- examples/web: render the kode wordmark lockup on the off-white canvas
- brand-guidelines: real specs (lockup, palette, typography, logo variant rules)
- README: add brand-at-a-glance, bump version to beta

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

foundations/typography/README.md

@@ -1,8 +1,14 @@
 # Foundations · Typography
 
-Reference documentation for the **typography** foundation. The canonical token values
-live in [`../../design.md`](../../design.md) and the machine-readable export
-in [`../../tokens/`](../../tokens/).
+KDS uses two brand typefaces:
 
-This page is for human-facing rationale: when to use which token, examples,
-and platform notes.
+| Family | Use | Weights |
+|--------|-----|---------|
+| **Opificio** | Wordmark and display moments only. | Bold (700) — canonical. Rounded and Regular cuts available for editorial. |
+| **Manrope**  | All UI typography — headings, body, labels, captions. | 200 ExtraLight, 300 Light, 400 Regular, 500 Medium, 600 SemiBold, 700 Bold, 800 ExtraBold |
+
+Roboto Mono is available as a non-brand fallback for code and tabular figures.
+
+The wordmark lockup pairs them: `kode` in Opificio Bold (72pt, 52pt spacing) above `design consultants` in Manrope ExtraLight (20pt, 76pt spacing).
+
+Canonical token values live in [`../../design.md`](../../design.md); machine-readable typography tokens are in [`../../tokens/typography.json`](../../tokens/typography.json).