Function lora_rotate_env 

pub fn lora_rotate_env() -> bool

2026-09-25: METRALE_LORA_ROTATE (1 or true, any case), from the process-wide ModelLevers::get(). It, or lora_peer_env, sets the model’s lora_rotatable, which permits runtime adapter rotation and swap whatever the number of resident adapters. It does not make decode eager; only METRALE_LORA_EAGER does. met serve refuses --lora-stageable-disk unless this or a peer is set.