The delegation nginx image was hardcoded as nginx:1.28.3 in the
deployment template. It is now rendered from the new values
matrix.delegation.image.repository / matrix.delegation.image.tag,
defaulting to nginx:1.30.4 (current stable line, tag verified against
Docker Hub). README documents that auxiliary/sidecar images are pinned
via values and reviewed with every app-version update round.
Chart version: 4.1.1+upv1.159.0 -> 4.2.0+upv1.159.0 (minor: additive
values change).