Slice order and acceptance tests for the spec #8

Part of #1

Question

Given the research and the baselines, what are the ordered build slices of the spec, and what is each slice's acceptance test?

Decide:

• the slice order, from NHI bring-up through PCIe and USB3 tunnels, DisplayPort tunnels through the dock, hotplug and s2idle, to eGPU compute;
• which slices are kernel and which are m1n1 (isolated, with rollback);
• each slice's acceptance test against the baselines.