Handbook (this surface): public, versioned, human-readable. Decisions, architecture, conventions, playbooks, lessons.
Roadmap (mem://preferences/roadmap): ordered next-move backlog and recently shipped. Read at the start of any planning turn.
Memory (mem://): rules applied automatically. Not a scratchpad — save preferences, constraints, features, references, and design decisions only.
Every handbook entry has a version. Bump the version when the meaning changes, not when you fix a typo. Update the updated date on any change.