Stryker.NET becomes CultLib's mutation tool (CultMath config, baseline 2243
mutants, 350 survived). Behavioural tests close the three areas Aetheria
leans on: the BatchMath SIMD body, first_order_intercept's branches, and
equality and comparison across the vector types. 350 -> 264 survivors;
Soul passed the cut after one accumulation test was added.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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