Deploy Stage 2 decoupled Event-Driven Conversational Runtime architecture

Optimize build speed: cache CPU-only PyTorch and remove custom USER instruction

Security Hardening: CORS limits, WebSocket token auth & rate limits, audio size caps, prompt sanitization, error message masking, and non-root Docker user

Set default PORT to 7860 for Hugging Face Spaces

Deploy Speech-to-Speech real-time app to HF Spaces