ShiftedSchedulerType

Akka.NET's default scheduler on real time, telling a time moved by `Shift`. FCQRS stamps commands and events with the scheduler's `Now`, and `IActor.TimeProvider` tells the same time. A test that lets time pass sets `Shift`, and every aggregate decision and every reader of `TimeProvider` sees the later time without the test waiting for it. Timers keep running on real time, so command timeouts, saga handshakes and cluster sharding behave as they do in production. `ObservingScheduler` is the choice when a test must control when timers fire instead. Set it with `akka.scheduler.implementation = "FCQRS.Scheduler+ShiftedScheduler, FCQRS"` and reach it as `api.System.Scheduler :?> ShiftedScheduler`. A shift back makes later commands carry earlier dates than earlier ones; a test that does so must not compare dates across it.