Function fp8_act_quant_hopper_enabled 

pub fn fp8_act_quant_hopper_enabled() -> bool

Is the twin selected? — [defaults] fp8_act_quant_hopper, with ATLAS_FP8_ACT_QUANT_HOPPER overriding (super::target_defaults).

No ATLAS_NO_* rung: the two kernels emit the same bytes, so there is no accuracy question for a kill switch to outrank what ATLAS_FP8_ACT_QUANT_HOPPER=0 already says.