CMake project structure with ymir_core, ymir_naval, and ymir_adapters
static library targets. Catch2 and nlohmann/json via FetchContent;
SUNDIALS and CGAL probed as optional system deps (required from M1/M2).
Smoke tests pass on macOS ARM64. Docker multi-stage image for Linux
x86_64. GitHub Actions CI matrix: Linux x86_64, macOS ARM64, Windows
x86_64. Code quality tooling: .clang-format, .clang-tidy, Doxyfile.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
