Three-Body Lab v1.0.0

Stable reproducible research-product release. The deterministic 42-cell register, integrator checks, conservation diagnostics, and Lyapunov tolerances were regenerated and verified. Product version 1.0.0 does not alter the frozen v0.1 study. See docs/v1-release-audit.md for sources, reproduction, deviations, limits, and the exact release commit.