Hello World

By the end of this guide, you will:

• Write your first VIEW callable that renders text

• Write your first UPDATE callable that handles keyboard input

• Handle ‘q’ and Ctrl+C to quit the application

• Use predicate helpers (.q?, .ctrl_c?) for key checks

• Run your app and see output in the terminal

• Identify the entry point that starts your application

• Explain what a VIEW callable returns (RatatuiRuby widgets)

• Explain what an UPDATE callable returns (new model and command)

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