The Authentik group policy denied admins: it gated on kubernetes-* group
membership, but cluster access is email-based RBAC (User bindings from
k8s_users), not group-based. vbarzin@gmail.com (Home Server Admins) gets
cluster-admin via oidc-admin-vbarzin but isn't in any kubernetes-* group,
so the gate locked him out. Apiserver RBAC is now the sole gate — matching
the kubelogin CLI (authenticate freely, RBAC decides actions).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>