Ghostty's terminfo entry doesn't enable 24-bit color*, and as far as I can tell they don't provide a "ghostty-direct" entry that does. It just seemed odd that it's completely supported and working, yet not easily enabled. Maybe I just missed a trick, and didn't need to make a custom terminfo entry myself?

* "msgcat --color=test" is an easy test that shows the blending of 24-bit color, or blocky gradients otherwise.