I've cobbled something together which helps a little bit: Create a "Results Log.mxd" whose only purpose is to store results, there are no feature classes or map layers. From the ArcMap or ArcCatalog sessions containing notable work:

1. Rename result as makes sense to your workflow
2. Drag and drop to Results Log >> Results >> Shared.

Caveats:

It's a good idea to prefix names with step numbers or letters as there is no control over list order, and the order will shift from one saved session to another.

Dragging from "Current Session" doesn't work. Save and re-open the mxd, then drag from "Previous Session".

I've cobbled something together which helps a little bit: Create a "Results Log.mxd" whose only purpose is to store results, there are no feature classes or map layers. From the ArcMap or ArcCatalog sessions containing notable work:

1. Rename result as makes sense to your workflow
2. Drag and drop to Results Log >> Results >> Shared.

Caveats:

It's a good idea to prefix names with step numbers or letters as there is no control over list order, and the order will shift from one saved session to another.

Dragging from "Current Session" doesn't work. Save and re-open the mxd, then drag from "Previous Session".