Add RBAC page with diagram - New RBAC.md (FR): authorization model, subjects/verbs/resources, Role vs ClusterRole, RoleBinding vs ClusterRoleBinding (valid combos), manifests, least-privilege best practices, kubectl auth can-i / inspection commands - New images/rbac.svg (Sujet -> Binding -> Role -> Ressources + combos callout) - Add page to Home and _Sidebar; update AGENTS.md page list