Dear ImGui v1.92.9b (https://github.com/ocornut/imgui, tag v1.92.9b), MIT License (LICENSE.txt).
Unmodified core library, plus a locally extended backends/imgui_impl_metal (Metal renderer) and
backends/imgui_impl_sdl3 and backends/imgui_impl_sdlrenderer3 for the graphical installer (tools/installer/gui).
The Vulkan renderer and the input feeding are the game's own (runtime/src/overlay/), so they can share
the renderer's command buffers, formats and threads.
The Metal backend recognizes guest HUD alpha/additive markers, decodes mod PNG samples for sRGB
targets, and releases registered HUD metadata after device-texture teardown. These extensions
share the existing overlay pass; the corresponding Vulkan implementation is runtime/src/gfx/vulkan/overlay.cpp.
imgui_demo.cpp is not included (IMGUI_DISABLE_DEMO_WINDOWS).
