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The callable evaluators in evolve_function and evolve_algorithm used closure-based functions stored in globals(), which don't survive across process boundaries. Since the switch to process-based parallelism (c2f668a), subprocess workers cannot access the parent process memory, causing "module has no attribute '_openevolve_evaluator_*'" errors. Fix by serializing evaluators as self-contained code strings instead of closures. Also adds combined_score to returned metrics to prevent the misleading score averaging warning. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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will also fix #441