CodeReclaimers / neat-python / 23789324450

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Fix fitness_criterion='min' ignored in best-genome tracking, stagnation, reproduction, crossover, and statistics

The fitness_criterion config parameter was only used for the termination
check. All other fitness comparisons hardcoded "higher is better",
making fitness_criterion='min' fundamentally broken (GitHub issue #187).

Added is_better_fitness(), meets_threshold(), and worst_fitness() methods
to Config as the single source of truth for fitness direction. Updated
population.py, stagnation.py, reproduction.py, genome.py, and
statistics.py to use direction-aware comparisons throughout.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

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