Move 24 prearm/capture-commit/MacroValue-builder methods verbatim
into MacroPrearm (predicateFuture through waitForPacketMatch).
Shared members referenced as MacroExecutor.xxx (mechanical
qualification only); staying and earlier-helper call sites re-pointed
to MacroPrearm.xxx. PrearmedWait widened to package-visible. All
bodies verified identical against HEAD modulo that qualification.
