HELLO WORLD !
This example demonstrates the foundational "Hello World" pattern for the VizHub V3 Runtime Environment, rendering a centered text string whose font size is an adjustable numeric variable. The code exports a `main` function that receives a container element, using its inner HTML to display the text with a fixed inline style. It highlights the new runtime's simplified entry point, which replaces an `index.html` file, while supporting continuous hot reloading and interactive editing through Alt-drag on numeric values in the code editor.