textbook

Use when the user wants to write a complete multi-chapter textbook or systematic course material with exercises — e.g. "写教材"、"写一本教材"、"编写课程讲义"、"系统教材"、"textbook". Orchestrates a five-stage UbD-driven pipeline (教学定位 → UbD 预期结果 gate → 章节树 gate → 逐章写作 → 审核定稿) with resumable progress via .progress.json. N