handoff

# Handoff Synthesize the current conversation into a compact handoff brief, save it to disk, and return a paste-ready prompt for a fresh chat. The new chat opens with clean tokens but full continuity. ## When to invoke User triggers `/handoff` when: - Current conversation is token-heavy and response quality is degrading. Judge this as a FRACTION of the current context window, never as an absolute token count: windows differ by model and platform, so a fixed number is right on one and useless on another. Roughly two thirds of the window is where quality typically starts to slip (on a very large window that is 400k or more; on a smaller one it arrives far sooner). Where the platform exposes no token count, use the observable proxies instead: the session has run long, earlier detail is being forgotten, or answers are drifting off what was agreed. - They want to stop now and resume later in a clean session. - They're about to switch topics and want a clean slate without losing the thread. This skill is user-invocable only. Never self-trigger. **Host note.** The method assumes two things about the environment: that a file can be written somewhere durable, and that the user can be shown a multiple-choice question. Where a host has no filesystem, output the brief in chat as one fenced block for the user to save themselves, and point the paste-ready prompt at wherever they put it; nothing else in the method changes. Where a host has no pop-up question mechanism, ask the same que...