- SceneNode: position/rotation(scale) + parent/child hierarchy
- World matrix: local = translate * rotate * scale, world = parent.world * local
- Euler/Quaternion rotation support
- Dirty flag propagation for efficient updates
- Scene init/find/create/destroy operations
- WIN32 subsystem, D3D11 standalone rendering (no UILayer dependency)
- Scene tree panel, Inspector panel, Console panel, Viewport
- Chinese text via glyph_atlas (GDI GetGlyphOutlineW + D3D11 texture atlas)
- .ly file format: INI-style scene serialization (save/load)
- Ctrl+S/Ctrl+O keyboard shortcuts
- Depth test disabled for all 2D rendering