checkpointlisted

# Checkpoint: prepare for compaction, deliberately Automatic compaction is the enemy of a clean context. It fires without warning, gives the model no turn to prepare, and flattens the reasoning into a summary that keeps roughly what happened and loses why. This skill is the answer: **you turn auto off, and instead fire this checkpoint by hand whenever the window is getting full, right before you run `/compact` yourself.** The whole point is that a manual pass HAS a turn. So unlike a hook or an auto-compact, it can actually think: read the session, decide what matters, write it down well, and hand you a clean state to compact from. Quality preparation is only possible manually. This does two things a raw `/compact` cannot: it makes the durable context **complete and current** before the summary is taken, and it keeps the **red thread** (where we are, what is next) explicit on disk so nothing depends on the summary being good. ## What it is not - It does **not** run `/compact`. It prepares; you compact. The last line it prints is the go-signal, then you type `/compact`. - It is **fired by hand**, by you, before every manual `/compact`. The `Stop` hook can fire it once enough work has piled up, but that is opt-in and ships off, because a pass that starts on its own interrupts work nobody asked to interrupt. Where it is switched on, the phases are the same with one difference: an auto-fired pass is housekeeping nobody asked for, so it reports **one sentence** (it r