Unified profiles for people the user interacts with or researches. Each person gets one file named by full-name slug (john-smith.md). Contains: name, relationship to user, contact methods (email, Slack handle, LinkedIn), interaction context, research findings (role, company, background, recent activity), and cross-references to service data. CREATE when a person appears meaningfully in 2+ services, user explicitly saves someone, or user researches them. UPDATE when new context emerges. MERGE entries if same person discovered across services. Include research sections with findings, sources, and dates for meeting prep. Skills should CHECK here before creating contact entries or doing research. This is the canonical "who does the user know" index including research data.