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Add an opt-in, per-instructor email notice sent when someone books one of their lessons or enrols in one of their group classes. Off by default and set from My Availability → Notifications; covers both the student/guardian REST flows and the studio's wp-admin "book/add for a student" forms. The opt-in check lives in InstructorNotificationMailer so no booking path can drift on who is mailed; lessons fire from LessonBooker::settle (the one step both booking paths reach), enrolments from EnrollmentEndpoint::enroll and GroupClassController::addDirect. The notice is a courtesy and never fails a booking or enrolment that otherwise succeeded. Co-authored-by: anthropic/claude-opus-4-8