Normalize all header comments to Doxygen @brief form and fill in missing class/method docs across engine common, cmdline, and module headers (~2368 @brief entries). Add root Doxyfile, 'make docs' target, CMake docs target, .gitignore for docs/api, README/docs/dev updates, and a Windows (native) + code-conventions section in AGENTS.md.
- Updated .gitignore to include new build and output directories for SDK packaging.
- Modified CMakeLists.txt to include installation script for SDK.
- Enhanced Makefile to support new SDK targets for various platforms.
- Improved documentation to reflect new shader capabilities and 3D model support.
- Added new shader functions and updated rendering systems to utilize custom shaders.
Co-authored-by: Cursor <cursoragent@cursor.com>
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