X1: 26.3 and create-instancing pass under inproc on both backends, zero declined
faults, tracker line confirms tag=0xb4. F1: the R-8 line is gone in every run, yet
OpenRA reads 0.976494 on a cold driver cache (three pm-clear runs identical), 1.0
warm, 1.0 cold monolith, and FRAMESINFLIGHT=1 flips it half the time - a GPU-timing
race on the wire readback/present path, handed to package B as slice 0.
