Session takeover: read-only pull local sessions from nine external agents (Claude Code, Codex, OpenCode, ZCode, Pi, WorkBuddy, Cursor, Grok, Gemini CLI) into distilled six-section handoff cards — one click on the Relay chip takes over. /handoff checks the current session into the handoff: 1 open-protocol inbox (~/.handoff, consume-once with machine-signature tamper detection); any agent picks up on start and continues. Memory files ride with cards; cross-machine relay is one env var away.