BestSolutionCsvWriter

Single-row CSV of the best solution found by an optimization run.

Useful for stacking multiple runs into a single comparison sheet (e.g. one row per (analysisName, algorithm) combination).

Column order:

1. One column per decision variable, in OptimizationProblemSpec.inputs declaration order

2. est_obj

3. pen_obj

Substrate-level API — usable by any UI shell.