Here is my meager contribution. I’m going to assume I also don’t have permissions to post an image (update: or even a link to one, apparently) since i just registered, but here’s a link! Click on the image for full size.
Whipping together a legend graphic, but the idea is: (1) ember orange -> state, (2) light ember orange -> api hook/callback (3) grey -> function (4) arrow leading into a box is a function call, leading out from a state is a transition… etc etc.
Minimalism and blending in with the existing ember design language are the main drivers, here. I also modified the graphic slightly for clarity.