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.
- Added new methods for event polling and handling in the Event module, including `pollName` for retrieving message names.
- Introduced new graphics functions for clearing the screen and drawing solid rectangles with RGBA support.
- Updated the Window module to expose new settings and graphics functionalities.
- Refactored the main script to utilize the new graphics and event features, improving the example game structure.
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