[Notes] enrichment

Hero: a full head taller than Landen and Maledic, handsome, tank top, upbeat spotter — consistent with published. Drex: notes add the flat stare, zero tolerance for excuses, and being secretly invested in students' survival ("the difference between alumni and casualties"). [Conflict]: the "Landen - Teams" draft scene calls him "Professor Gareth Drex" — published chapters use Garrick Drex; follow published.