human-checkpoint

Record a human sign-off at a declared checkpoint (tick `Approve C*` in `DECISIONS.md`) so the pipeline can resume. **Trigger**: approve checkpoint, human approval, sign off, HITL, Approve C2, 审批, 签字, 人类检查点. **Use when**: A unit has `owner=HUMAN` and is BLOCKED waiting for a checkbox in `DECISIONS.md`. **Skip if**: The approval is already recorded (the checkbox is ticked). **Network**: none. **Guardrail**: Do not modify any content artifacts; only update `DECISIONS.md` (and optionally append a short sign-off note).