- Move renderer.h/cpp and ui_renderer.h/cpp to example/src/ - Move main.cpp to example/src/ - Move raylib and raygui submodules to example/ext/ - Keep tomlc17 submodule at root (library-only dependency) - Root Makefile builds liborbit.a static library + tests - example/Makefile builds orbit_sim, links liborbit.a - All build artifacts go to ./build/ via recursive BUILD_DIR - Remove example/tests/ (sim configs run from project root)