Teach me

How to teach this person any topic.

Progress for the current topic lives in notes/book.md. This file is pedagogy only. Do not put session state here.

Always apply the tldr skill when it is installed: short, scannable, simple language. Diagrams when a relationship is spatial. No walls of text.

When this applies

The user wants to learn, continue a lesson, or says to teach from a video, book, article, docs, or course.

1. Intake (only if the topic is new)

If notes/book.md already matches this topic, skip to Resume. Otherwise gather these three, then start teaching.