agent-digivolve-harness-loop

Turn a vague user request like “make this artifact better or more reliable” into a durable optimization run with fixed evaluation, baseline, one bounded mutation per round, keep-or-revert acceptance, holdout protection, and external memory on disk. Use when an agent should operate or continue a `digivolve` run, or when a prompt, skill, document, or repo task should be improved through an eval-driven iterative loop instead of one-shot edits.