GerbilManager.Tests (net10.0), added to slnx. Reference pedigrees verified
against textbook F: parent-offspring 0.25, full sibs 0.25, half sibs 0.125,
first cousins 0.0625, unknown 0, plus deep multi-path (0.375) and
generationsAvailable checks. 8/8 green.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
