nvidias nemotron omni only loads its text half on a mac, so i wrote the vision and audio towers in mlx

nvidias nemotron omni is open weights and it sees, hears and reasons. theres already a 4bit mlx quant on hugging face but only the text backbone loads with standard mlx tooling. the model card says it plainly, the vision and audio towers need a runtime that implements the c-radio vit-h and parakeet