add dit_input_seq stage for LocDiT debugging

update reference: add cfm_mu stage for exact CFM replay

update README with q4_k, ref.gguf, architecture diagram, validation status

add reference GGUF for crispasr-diff numerical validation (prefill stages, BF16 inference)

Upload voxcpm2-q4_k.gguf with huggingface_hub

Upload voxcpm2-f16.gguf with huggingface_hub

Upload README.md with huggingface_hub

initial commit