*sees Balatro modding is now a thing*
"I wonder how modding works"
*looks for modding docs; none appear to exist*
"...they're on the Discord aren't they"
Never mind, figured it out. I am good at Doing Research and Not Overreacting Early.
Still, things existing exclusively on Discord still is a thing that shouldn't happen.
However, in this case, it's all pretty much here: https://github.com/UwUDev/balamod