pub fn lora_no_ffn() -> boolExpand description
2026-09-25: METRALE_LORA_NO_FFN equal to "1", read once per process: the dense-FFN
(dense_ffn.rs) and GDN out_proj (qwen3_ssm/lora.rs) skip their deltas, and the attention
deltas still apply. A measurement lever; the output is wrong while it is set.