Why not glow

glow is good, and this keeps its flags and its keys so muscle memory carries over. But rendering the same document through glow 3.0.0 shows what this fixes:

glow	marquee-markdown
## Heading — hash marks reach the output	typography: weight, color, rhythm, a hairline rule
[!NOTE] printed literally	an icon-and-title callout in its own hue
Tables with no outer frame, columns stretched to the full width	box drawing with a shaded header band, columns sized to content
Thematic breaks as --------	a hairline ─ across the column
Long code lines wrap out of the block	they stay sealed inside the card
Raw HTML in a README printed tag by tag	interpreted: the title joins the contents pane, badges read as links, an HTML list and an HTML table are drawn like any other
Link targets printed inline, interrupting the sentence	link text reads as text; ] walks them, enter opens
2-space margin	a centered reading column, page painted edge to edge
No outline, no in-document search	a scroll-tracking contents pane, and / n N
Keys hardcoded, cannot be rebound	every key resolves through a rebindable action table

The last two rows are the ones that made this worth building. The rest are rendering details that add up.