The /v2/token endpoint now detects when the password looks like a JWT
(contains two dots) and validates it directly against MCIAS before
falling back to the standard username+password login flow. This enables
non-interactive registry auth for service accounts — podman login with
a pre-issued MCIAS token as the password.
Follows the personal-access-token pattern used by GHCR, GitLab, etc.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>