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.
- Improved CMake configuration for Vulkan on iOS, allowing for dynamic and static linking of MoltenVK based on availability.
- Updated the script for resolving Vulkan SDK paths to prioritize dynamic frameworks and provide warnings for missing components.
- Introduced a new scene module, enabling a declarative scene tree structure that mirrors the UI system, enhancing the engine's capabilities for scene management.
- Updated documentation to reflect the new scene module and its integration with existing systems.
- Enhanced test coverage by including new tests for the scene module.
These changes significantly improve Vulkan support on iOS and expand the engine's modular architecture.
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