@mattwilkie Is this ideas relevant for you anymore in ArcGIS Pro which does embrace the concept of projects?
In ArcGIS Pro, every project has a Geoprocessing History, similar to the ArcMap Geoprocessing Results. When working in an Untitled project, the history is not maintained if you close the project. However, all geoprocessing tools you run are available in XML log files, which is controlled using this geoprocessing options:
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