Massive refactor of API

- Switch to function based API
- Anthropic SDK style async generator
- Fully typed with escape hatches for custom models

packages/tui/test/multi-layout.ts

@@ -1,5 +1,5 @@
 #!/usr/bin/env npx tsx
-import { TUI, Container, TextComponent, TextEditor, MarkdownComponent } from "../src/index.js";
+import { Container, MarkdownComponent, TextComponent, TextEditor, TUI } from "../src/index.js";
 
 /**
  * Multi-Component Layout Demo
@@ -75,4 +75,4 @@ ui.onGlobalKeyPress = (data: string) => {
 	return true;
 };
 
-ui.start();
+ui.start();