Use when a Plan Session has a student-approved Lesson design recorded in the current Plan and must materialize that approved Lesson.
在学生从固定入口自由提问、带学习资产继续讨论或明确结束自由学习线程时使用。
Use when a Lesson Session teaches, adapts, records, or finishes the current block-based class.
Use when a Plan Session first interprets its stage, reviews closed Lessons, discusses the next Lesson, or discusses stage closure before student approval.
Use when a Roadmap Session introduces a learning set, diagnoses long-horizon learning needs, reviews progress across Plans, or discusses a first or next Plan before student approval.
在根级 Meta Session 讨论学生是否需要长期学习路径，并在明确批准后只创建 Roadmap 时使用。
Use when a Roadmap Session has a student-approved Plan design recorded in ROADMAP.md and must materialize that approved Plan.