Write a layman's tagline

[marceline-cramer]

Hearth's current tagline is "Shared execution environment for constructing 3D virtual environments from the inside."

That kinda blows! Please help us make a new one that is actually legible to the average computer user.

Key points I'd like to represent in a new, layman-friendly tagline for Hearth:

• Hearth is always-on. you don't need to restart it to modify it.
• Hearth is 3D. its purpose is to build 3D environments.
• Hearth is editable from the inside. you can extend it using itself.
• Hearth is a scripting environment. you write scripts for its runtime to add content.

Somewhat-meaningful but vague buzzwords that are Hearth-adjacent are VM, OS, kernel, and IDE.