Function load_dflash_weights 

pub fn load_dflash_weights(
    drafter_store: &WeightStore,
    drafter_config: &DflashConfig,
    _gpu: &dyn GpuBackend,
    _tp_size: usize,
) -> Result<Option<DflashWeights>>

2026-09-25: Load the drafter’s weights from the drafter’s own WeightStore.

Returns Ok(None) when store_has_dflash_weights is false. Otherwise fc, the two model norms and num_hidden_layers layers of norms and projections are required; the conv, selector, Markov and confidence tensors are optional as their fields describe. _tp_size is unused, so every rank loads the whole drafter.