Function pack_store_into_slot 

pub fn pack_store_into_slot(
    lw: &mut LoraWeights,
    slot: usize,
    name: &str,
    store: &WeightStore,
    peft: &PeftAdapterConfig,
    cfg: &ModelConfig,
    gpu: &dyn GpuBackend,
) -> Result<Vec<Option<LoraLayerWeights>>>

2026-09-25: Disk swap: audit store and pack it into existing pool slot of lw in place, with the same audit_adapter and pack_slot as the startup load. The slot region is zeroed first, since it still holds the previous adapter. Then the slot’s name, config and pairs are replaced, its pointer and scale table entries refreshed, and its generation bumped. Returns the new pairs so the caller can re-install them when the slot is active.

Refused, before anything is written: slot >= max_loras, a slot with in-flight sequences, and adapters with router, expert or token-overlay tensors.