feat(renderer): add React PageRenderer with UISpec rendering

TypeScript renderer for UISpec pages: PageRenderer component, layout
engine, component registry, expression evaluator, interaction handler,
datasource connector, reactive state store, and assistant-ui components.
Includes vitest test suite.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: grokify

renderer/dist/PageRenderer.d.ts

@@ -0,0 +1,10 @@
+import React from 'react';
+import type { PageSpec } from './types';
+export interface PageRendererProps {
+    page: PageSpec;
+    className?: string;
+    style?: React.CSSProperties;
+    onError?: (componentId: string, error: Error) => void;
+}
+export declare function PageRenderer({ page, className, style, onError }: PageRendererProps): React.ReactElement;
+//# sourceMappingURL=PageRenderer.d.ts.map

renderer/dist/PageRenderer.d.ts.map

@@ -0,0 +1,8 @@
+export { PageRenderer } from './PageRenderer';
+export type { PageRendererProps } from './PageRenderer';
+export { registerComponent, getComponent, hasComponent, listComponents, clearRegistry } from './registry';
+export type { ComponentProps, UIForgeComponent } from './registry';
+export { Layout } from './layouts';
+export type { PageSpec, PageMetadata, LayoutSpec, LayoutType, LayoutConfig, BreakpointConfig, LayoutRegion, ComponentInstance, Position, Binding, VisibilityRule, Interaction, InteractionTrigger, InteractionAction, NavigationSpec, NavItem, ThemeRef, } from './types';
+export { API_VERSION, KIND_PAGE } from './types';
+//# sourceMappingURL=index.d.ts.map

renderer/dist/PageRenderer.js

@@ -0,0 +1,10 @@
+import React from 'react';
+import type { LayoutSpec, ComponentInstance } from './types';
+interface LayoutProps {
+    layout: LayoutSpec;
+    components: ComponentInstance[];
+    renderComponent: (instance: ComponentInstance) => React.ReactNode;
+}
+export declare function Layout({ layout, components, renderComponent }: LayoutProps): React.ReactElement;
+export {};
+//# sourceMappingURL=layouts.d.ts.map