Agent Skills: background-planner

Run bounded parallel planning with independent planner personas and optional multi-LLM workers, then synthesize a single plan via stance-steered consensus with explicit conflicts and open questions. Use only when the user explicitly requests background, parallel, or multi-agent planning, such as "백그라운드 기획", "bg plan", "병렬 기획", "멀티 AI 기획", or "N명이 기획". Do not trigger for ordinary planning or design requests.