Studio access model
OneField now supports builder access for existing profiles. Admin/steward actions still require real account roles, while builder access can use Studio basics.
Real account
Email plus stored password. Keeps admin/steward authority when the user role allows it.
Builder access
Use any existing builder handle. This opens Studio as a builder without granting admin-only authority.
Protected operations
Production write intents, OneAI live calls, and privileged refresh routes still require elevated roles.