module-planner

Use when a tutorial concept DAG exists and the run needs an ordered teaching plan with objectives and outputs. **Trigger**: module plan, tutorial modules, course outline, 模块规划, module_plan.yml. **Use when**: tutorial 的 C2，已有 `outline/concept_graph.yml`，需要把 concept DAG 收敛成模块顺序。 **Skip if**: 还没有 conce