idea-brief

Lock an ideation run into a single-source-of-truth brief (`output/IDEA_BRIEF.md`) and a replayable multi-query plan (`queries.md`). **Trigger**: idea brief, ideation brief, research ideas, brainstorm, 找 idea, 选题, 点子, 找方向. **Use when**: the user wants research ideas and their input is long / multi-turn; you need to clarify scope+constraints before retrieval. **Skip if**: the goal is to write a survey draft directly (use `arxiv-survey*` pipelines instead). **Network**: none. **Guardrail**: do not invent papers/citations; do not start retrieval here; keep the brief structured (no long prose).