simInit-phase messages/warningsExtracted from simInit()'s withCallingHandlers() so the same prefixing
(loggingMessage(..., prefix = prefixSimInit), plus cli-progress-tick
throttling) can be reused by restartSimInit() when it resumes the
.inputObjects phase outside the original simInit() call.
.simInitMessageHandler(m).simInitWarningHandler(w)
A condition (message / warning).