Swaps the single fixed admin UUID that every admin-write/admin-read RLS policy and the frontend's ProtectedRoute check against, moving off the personal belviskhoremk@gmail.com account onto a dedicated admin@braidsbymira.com login created via the Auth admin API. Updates the RLS test suite's admin-impersonation UUID to match. Claude-Session: https://claude.ai/code/session_01NhxA4npAXAxmCDEJt6kxSH