WOW_RUNTIME_PHASE

Spring lifecycle boundary for the single high-level Wow runtime.

The phase is lower than Spring Boot's web-server start/stop phase so Wow is ready before ingress opens and is stopped only after ingress has drained. Unexpected runtime termination is reported through onUnexpectedTermination; the Starter uses that callback to close the application context.

Construction is inert. The exclusive termination-control subscription is installed on the first lifecycle start or stop operation.