Technical details:
- Add VibeVoice model loading and caching to ModelManager class
- Modify VibeVoice adapter to use ModelManager instead of creating own engine instances
- Add load_vibevoice_model() and unload_vibevoice_models() methods to ModelManager
- Import VibeVoice components into ModelManager with availability checking
- Update adapter to cache model and processor instances via ModelManager
- Follow ChatterBox pattern for persistent model caching across node executions
diodiogod
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