AI-synthesized US healthcare and biotech sector intelligence brief. Assembles 10 real-time signals from Yahoo Finance: healthcare sector ETF (XLV), large-cap biotech (IBB), small-cap biotech (XBI), Eli Lilly, UnitedHealth, J&J, AbbVie, Moderna, Pfizer, and Medtronic. Returns biotech risk-appetite signal, healthcare-regime classification, and a 200-word GPT-4o-mini narrative covering sector momentum, managed care vs biotech dynamics, and agent decision implications.