After #5812, our primary goal is to enable splitting boxes dynamically as simulations progress (and later on, if needed, merge some again).

I created a small test case (CPU, laptop-size) that we can use to experiment with dynamic splitting of boxes: https://drive.google.com/drive/u/0/folders/1_jyUBo13_5JpmbU_keB2BrEUB2MTtqqP

This is very representative of cases in KISMET (modeled after thrust 3, but applies similarly to the hot spot physics and our current CY25 INCITE).