All user-creation paths (admin create, bulk invite import, public application
contact + team members, project team members, jury-group + special-award
invites) now set roles=[role] so the invariant role in roles[] holds for new
users, matching seed.ts and the role-change mutations. Prevents the empty
roles[] inconsistency that hid primary-role mentors from the mentor picker.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>