hf_weight_export

Per-module quantized weight export.

The leaf of the export pipeline: packing one module’s weight into its quantized representation and registering the scale buffers beside it, plus the registry dispatch and the whole-model walk that drive it.

Like hf_export_prep, this imports only leaf helpers (model_config, quant_utils, registry) and never an exporter, so the exporters and the MoE/handler plugins can import it directly instead of lazily.