Upload assets/avatar.png with huggingface_hub

Update biography: add GM tenure line, missing certs, missing AT&T roles

Fix: simplify launch for HF Spaces compatibility

Fix: remove unsupported theme parameter

Fix: remove unsupported footer_links parameter

Fix: remove unsupported Gradio ChatInterface parameters

Fix: add Gradio chatbot type=messages for HF Spaces compatibility

Fix: remove unsupported Gradio buttons parameter

Fix: remove duplicate closing paren

Fix: add HF_TOKEN auth for private dataset access

Fix short description length

Deploy: security-hardened RAG digital twin

initial commit