... which is entirely about communal world building
2) Those mini- and one-page games which are all-in-ones. There isn't time to flesh out the world, so world design throughout the game has to be done on the fly.
The classic examples of this are Howitt's one-pagers, such as
I feel like you missed a couple of "obvious" examples of collaborative worldbuilding.
1) i'm sorry did you say street magic
https://seaexcursion.itch.io/street-magic
... which is entirely about communal world building
2) Those mini- and one-page games which are all-in-ones. There isn't time to flesh out the world, so world design throughout the game has to be done on the fly.
The classic examples of this are Howitt's one-pagers, such as
https://gshowitt.itch.io/nice-marines
(And my own, but I won't link to them here.)