Supersedes the MEMBERSHIP model of the 2026-06-07 design (roster.yaml SSoT). Key principle: workstation access (T3 Users group membership) is decoupled from cluster authorization (k8s_users + kubernetes-* groups, untouched). A user is defined once in Authentik: email + T3 Users membership + optional os_user attribute. Provisioner reconciles accounts from the Authentik API; roster.yaml retires. v1 foundation (config inheritance, locked clone, kubeconfig, swap, hardening, emo cutover) unchanged.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
