Spending UX via SpendingSpec and SpendingFamily to tune spending function families with parameter candidates.
Parallel evaluation with {future.apply} (user controls future::plan()) and progress reporting via {progressr}.
Standardized metric extraction (uses gsDesign::gsBoundSummary() when available), plus ranking ($best()), Pareto filtering ($pareto()), plotting ($plot()), and reporting ($report()).
Reproducibility/audit features: stored job spec + sessionInfo(), per-configuration warnings/errors, and call reconstruction via $call_args(i); optional disk caching via cache_dir.