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 the zeroerr submodule to the latest commit for improved functionality.
- Modified CMakeLists.txt to include additional system libraries for better compatibility across UNIX platforms.
- Added <cstdint> includes in multiple header files to ensure proper type definitions.
- Introduced a new hotReload variable in the demo script to support dynamic updates.
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