website refactor

docs/architecture/website/UI_THEMING.md

@@ -142,23 +142,6 @@ Example conceptually:
   - `intent: default | danger`
   - CSS module uses variables like `background: var(--ui-color-intent-primary)`.
 
-### Primitives
-
-The primitives in [`apps/website/ui/primitives`](apps/website/ui/primitives) exist to build consistent semantics. They should not encode a “theme” directly; they expose minimal layout/styling mechanics.
-
-Examples in code today:
-
-- [`Box`](apps/website/ui/primitives/Box.tsx:1)
-- [`Stack`](apps/website/ui/primitives/Stack.tsx:1)
-- [`Surface`](apps/website/ui/primitives/Surface.tsx:1)
-
-Conceptually, primitives should either:
-
-- map typed props to standard CSS properties (style object), or
-- map typed props to CSS variables that are already in the theme contract.
-
-What primitives should **not** do: generate Tailwind class strings as their main behavior.
-
 ---
 
 ## Token naming: semantic + stable