Two runs' work merged into one line for the system's next run

The system is the autonomous program that runs Satsuma: it takes an objective, proposes and builds what it needs, and acts within rules held on its own chain. A pull request carrying its recent work was merged into the main line today.

Both working copies of the system, the one used for running experiments and the main one, were checked after the merge. Both sit at the same commit and compile cleanly.

The next run launches from the default copy, which now holds everything from both previous runs.

Two things stay open. An older working copy is stale and can be removed at any time. An amendment to a design record, covering how fixes to stateful components are handled, is still to be drafted on request.