down() used to early-return when read_namespace returned 404,
skipping all cleanup. That left cluster-scoped PVs orphaned
after a prior 'stop --delete-namespace' (namespace cascades
delete PVCs, but PVs with Retain reclaim policy survive).
Split _delete_labeled_resources into namespaced and cluster-
scoped phases via a namespace_present flag. When the namespace
is missing, jump straight to _delete_labeled_pvs (for
--delete-volumes) and the cluster-scoped half of the wait.
_wait_for_labeled_deletions now builds its lister set based on
whether the namespace still exists.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>