feat(site): add util reference pipeline (#537)

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

packages/react/src/utils/merge-props.ts

@@ -93,6 +93,7 @@ function mergeOne<T extends ElementType>(
  * - style: merged objects (external wins conflicts)
  * - other: last one wins
  *
+ * @public
  * @example
  * ```ts
  * const merged = mergeProps(

packages/react/src/utils/use-render.tsx

@@ -54,6 +54,7 @@ function getElementRef(element: ReactElement): Ref<unknown> | undefined {
  * - Ref composition
  * - className/style as functions of state
  *
+ * @public
  * @example
  * ```tsx
  * return renderElement('button', componentProps, {