Function magic_div_enabled 

pub fn magic_div_enabled() -> bool

Whether the W24 constant-divisor magic-reciprocal lowering is enabled. Default ON (it is bit-identical to Op::Div/Op::Mod for the proven non-negative dividend it gates on, validated by the corpus differential). LOGOS_MAGIC_DIV=0 is the kill-switch — also the A/B handle for measuring the lever’s effect on a quiet box. Read once.