Post a lesson to Canvas as a draft page using the school's lesson template. Use when the teacher says "post a lesson", "post a lesson page", "create a lesson page", "draft a lesson page", "put this lesson on Canvas", or has lesson content ready to materialize as a Canvas page. Fills every slot the school's lesson template defines (objectives, key concepts, resources, tasks, etc.), reviews with the teacher, then creates as a draft Canvas page. Generic — works with whatever lesson template the school config provides. For UbD-style pedagogical planning *before* posting, use `plan-lesson` first.
