Mediator API

The mediator pattern in Trax.Mediator routes train execution by input type. Instead of injecting specific train interfaces, you inject ITrainBus and dispatch by passing the input object. The bus discovers and runs the correct train automatically.

// Instead of:
var result = await _createOrderTrain.Run(orderInput);
 
// You can:
var result = await _trainBus.RunAsync<OrderResult>(orderInput);

This decouples callers from specific train implementations and enables train composition (nested trains that participate in the same metadata chain).