Add ibm-granite-speech-5-470m-turboctc_357MB: Granite Speech 5.0 470M TurboCTC custom-vocabulary CTC bundle (MelSpectrogram W32A32 fp16-io cpu, AudioEncoder W6A16 100% ANE, melCount 320, blank id 0, 188 frames / 15 s window; axon granite_speech/5.0-470m-turboctc)

initial commit