skippy-model
skippy-model owns validated source checkpoints: SafeTensors shard discovery,
immutable mapped tensor views, Hugging Face-to-llama tensor mapping and
transforms, tokenizer/config metadata, and canonical GGUF metadata generation.
Execution belongs to skippy-runtime; offline materialization belongs to
skippy-quantize. Both consume this crate so checkpoint-family mappings have a
single implementation.