Write a handoff document so a fresh session or another agent can pick up exactly where this one left off: goal, current state, decisions, next steps and the skills to load, referencing existing files instead of copying them, with secrets redacted before saving. Use whenever the user is ending a session, switching machines, running low on context, or asks for a handoff, a handoff doc, a 'pick up where we left off' summary, or to compact the conversation for next time. Saves to a location the user picks on first run (OS temp, home folder or per-project .handoff/) and can auto-load the latest handoff at the next session start.