Is there a history of the hardware changes to the Mini over the years? Something like the “release notes” available for Cura revisions.
Not that I know of. You can kind of build a general picture by looking at the part revision numbers in here: https://devel.lulzbot.com/mini/
Basically my understanding is that there are only minimal changes from 1.0 to 1.3, and then 1.4 brings in a new Y axis cable, and somewhere in there Dampers were added to the motors. You can visually see the differences between 1.3 and 1.4 here: https://ohai.lulzbot.com/