Kubernetes subcommands: describe, logs, shell, console,
restart, remote. Operates on the pods belonging to the active
deploy + release, resolved through the deploy's helm.namespace and
helm.kube_context.
Optional. Enable by listing Marea.Plugins.K8s under plugins: in
marea.yaml. Adds no new schema fields — every command reads the
namespace, context and cookie from the existing deploy spec. See the
K8s Plugin guide.