<!-- HARNESS MIRROR — do not edit here. Canonical source: skills/ or commands/. After editing source, copy into cli/assets/<harness / and repo-root harness mirrors. -- Context: this sub-skill is one lens of the broader skill. If the skill is also installed, read its SKILL.md first for Discovery + Anti-Slop + Craft Test, then apply the specific lens below. Load for the brief format before proceeding. Step 1: Detect existing brief Check whether exists. Use Read or ls on . If it exists: load its contents. If names a specific update ("update principles", "shift target user", "add out of scope"),…