AgenticMail — studied and declined; and how EVE becomes customer service

Consolidates three docs into this one (agenticmail-study-2026-10-19, agenticmail-eve-study, agenticmail-collab-record). Young, 2026-10-19: "Do we needed for EVE package?" and "How do we optimise EVE to become customer service in front-end and backend for working through orders and messaging — replacing the email need."