Hand-rolled parser + renderer for the launcher's description bodies.
Supports headers H1-H3, paragraphs, bullet + ordered lists, inline
bold/italic/code, inline images. No tables, blockquotes, links, or
code blocks. Font sizes per spec L-Q3 (H1=24, H2=20, H3=16, body=14).
Images resolve via engine.module.load_texture when a module_id is
provided to the renderer.
