The admin console runs on a separate tenant with its own user store.
Previous approach tried to assign a non-existent 'admin:admin' role
on the default tenant. Now creates the user on the admin tenant via
port 3002, assigns 'default:admin' role for Management API access,
and adds to t-default organization.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>