Stop no longer calls _delete_namespace() on every down. Instead,
deletion is scoped by app.kubernetes.io/stack=<stack-name> so
multiple stacks sharing a namespace are torn down independently,
and no namespace termination race blocks a following up().
Prerequisite: every V1ObjectMeta created by cluster_info.py and
deploy_k8s.py now carries the stack label via a new
ClusterInfo._stack_labels() helper (Namespace, Ingress, Service,
Deployment pod template, ConfigMap, Secret, PVC, PV, Endpoints,
Job, CA certs secret, external-service Services).
down() order: Ingresses -> Deployments -> Jobs -> Services ->
ConfigMaps/Secrets/Endpoints -> lingering Pods, then PVCs/PVs
only when --delete-volumes is passed. Kind cluster destruction
still gated by --perform-cluster-management.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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