The dispatcher discovers it with {@code ServiceLoader} and names no transport; a deployment without this module serves local content only (a proxy upstream is never consulted, an import is refused). The composed caches are their own {@code ObservabilitySource}s reporting their bounded {@code jenesis.proxy.*} used-vs-available signals, so it {@code requires} the equally minimal, registry-free {@code build.jenesis.repository.observation} SPI beside the format SPI and {@code java.net.http}.