Model-agnostic zsfm convert / zsfm inspect / zsfm pull: turn ANY supported
checkpoint (safetensors, sharded-safetensors index, PyTorch pickle, npy/npz,
ONNX, HDF5/Keras, GGUF) into a GGUF file with tensor names passed through
unchanged, list its contents, or just fetch a HuggingFace repoβs checkpoint in
whatever format it happens to be published in.