Just-in-time kubectl access

Engineers can now get time-boxed, approved kubectl access to environments Ryvn manages with Ryvn Connect, so nobody needs a standing kubeconfig for the cluster. Each grant is limited to a permission set of Kubernetes RBAC rules and namespaces, and approvers, whether your team or your customer in a BYOC deployment, see the exact access before they approve it. Approved access expires on its own, and every request stays on record for audit.