Constant MOE_ROUTED_DOWN_KNOWN 

pub const MOE_ROUTED_DOWN_KNOWN: E4m3Saturation;

2026-09-30: The routed experts’ down projection reads the SiLU product. On Qwen3.6-35B-A3B-NVFP4 it reaches 510 at position 0 of the last layer (measured 2026-09-29, no effect on the output); every other certified model stays under 448. The scaled cast that removes it is follow-up work, so this covers exactly the known value.