Retracted: v0.4.0 was tagged on the wrong commit (a small CI-permissions change that
branched off an older main, missing the release's actual content) and
published to the module proxy before the mistake was caught. The proxy
treats published versions as immutable, so the tag itself cannot be
corrected in place. The intended v0.4.0 content ships as v0.4.1.
Package consumer is a dependent feature module that consumes the notification
service. It is intentionally small so the monolith and remote examples can
share the same business code while wiring different implementations.