The previous commit (bc714755) added mutateExistingOnPolicyUpdate=true
to the inject-keel-annotations ClusterPolicy but Kyverno's validate
webhook rejected it: the background-controller SA needs update/patch
on apps/v1 Deployment/StatefulSet/DaemonSet.
Created live via kubectl + now in TF so the next apply is idempotent.
The ClusterRole aggregates into kyverno:background-controller via the
rbac.kyverno.io/aggregate-to-background-controller label.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>