Add migration 000064 renaming avatar_url column; expose profile_picture in API, sqlc, and Swagger. Co-authored-by: Cursor <cursoragent@cursor.com>
Introduce lms_personas table, repoint practice persona_id FKs off users, validate persona refs on LMS and exam-prep practice flows, personas.* RBAC permissions, and OpenAPI docs. Co-authored-by: Cursor <cursoragent@cursor.com>