transformers gguf mergekit merge OG_finetune_merge base_model:Qwen/Qwen2-72B-Instruct base_model:merge:Qwen/Qwen2-72B-Instruct base_model:alpindale/magnum-72b-v1 base_model:merge:alpindale/magnum-72b-v1 endpoints_compatible region:us