transformers gguf mergekit merge base_model:nbeerbower/Stella-mistral-nemo-12B-v2 base_model:merge:nbeerbower/Stella-mistral-nemo-12B-v2 base_model:nbeerbower/mistral-nemo-gutenberg-12B-v2 base_model:merge:nbeerbower/mistral-nemo-gutenberg-12B-v2 endpoints_compatible region:us conversational