The embeddable runtime core: everything the runtime is, except the decision to be an application.
An application that already exists — a host platform, say — puts this jar on its classpath and gets
the trust loop, the governance surface and the security filter chain through one auto-configuration;
keelbase4j-runtime is the thin application that does the same thing for a standalone deployment.
What is deliberately absent here is the application's half: no server configuration, no ...