mp-units

C++26 strongly-typed facade over Eigen, std::linalg, Kokkos, and Armadillo, adding Au, mp-units, nholthaus/units, and std::chrono strong types to matrix and vector operations. Turns unit mismatches, axis mix-ups, and reference-frame errors into compile errors, not silent runtime failures.

Blender path-tracing add-on with per-pixel light-path diagnostics, built on a type-safe C++ core (mp-units + pybind11).