Use whenever the user is authoring or modifying Kubernetes configuration stored in ConfigHub, or is about to reach for Helm, Kustomize, Jsonnet, cdk8s, or a values file. This skill enforces the "configuration as data" doctrine — Units contain fully-materialized, literal YAML, mutated in place via cub functions or direct edits, never re-rendered from templates. Load this proactively any time the user says things like "add a chart", "values file", "overlay", "template this", "parameterize", "set up Helm for this", "make this reusable across envs", or starts generating K8s YAML that will be stored in ConfigHub. Do not load for: pure import-from-helm / import-from-kustomize flows (those have their own skills that handle one-shot render + store), or authoring config outside ConfigHub.