transformers gguf merge mergekit lazymergekit mlabonne/OmniBeagle-7B flemmingmiguel/MBX-7B-v3 AiMavenAi/AiMaven-Prometheus en base_model:CultriX/MergeTrix-v3 base_model:quantized:CultriX/MergeTrix-v3 endpoints_compatible region:us imatrix