Framework for sample that doesn't render

I'm experimenting with writing a Debug Printf sample that would run a compute shader to generate Debug Printf output. I don't see a way to create a sample that doesn't create a window. It seems that before any of my code is run, a window has already been created. Is there a way for a sample to avoid window creation and simply output to the console window?

Start by tracing the sample startup path described in the issue to find where window creation occurs before sample code runs. Inspect the framework initialization and console-output handling; done means a compute-shader sample can run without creating a window and can emit Debug Printf output to the console.

Written by the indexing model from the issue text.