Send lesson homework emails to students after update

Lessons flagged to send leave students unclear on practice tasks and arrival details, causing unprepared sessions. Send reminders so students arrive prepared and instructors stay focused the same day.

Overview

Turn updated lesson records into ready-to-review homework drafts so students get clear practice instructions and instructors stop chasing missing prep. Draft emails appear within minutes of a record change, letting program coordinators verify content ahead of each session.