Function max_lora_expert_rank 

pub fn max_lora_expert_rank() -> usize

2026-09-25: The padded rank of the expert and router LoRA pools, METRALE_LORA_EXPERT_RANK (a positive integer; otherwise 16), read once. It is separate from --max-lora-rank, which sizes the slot pool. An adapter whose r exceeds it is refused at load (expert_pack.rs).