Function encode_adapter 

pub fn encode_adapter(
    context_type: ContextType,
    adapter_id: u8,
    rank: u32,
    alpha: f32,
    lora_a: &LoRATensor,
    lora_b: &LoRATensor,
) -> Vec<u8> 

Build a minimal valid .lora file from raw A and B matrices. Useful for generating test adapters and offline tooling.