Mock up of the software. Fully generated with Gemini 3.8 as a proof of concept.

vendor/rlImGui/imgui_impl_raylib.h

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+/**********************************************************************************************
+*
+*   raylibExtras * Utilities and Shared Components for Raylib
+*
+*   rlImGui * basic ImGui integration
+*
+*   LICENSE: ZLIB
+*   Copyright (c) 2020-2021 Jeffery Myers
+*
+*   This software is provided "as-is", without any express or implied warranty. In no event
+*   will the authors be held liable for any damages arising from the use of this software.
+*
+*   Permission is granted to anyone to use this software for any purpose, including commercial
+*   applications, and to alter it and redistribute it freely, subject to the following restrictions:
+*
+*     1. The origin of this software must not be misrepresented; you must not claim that you
+*     wrote the original software. If you use this software in a product, an acknowledgment
+*     in the product documentation would be appreciated but is not required.
+*
+*     2. Altered source versions must be plainly marked as such, and must not be misrepresented
+*     as being the original software.
+*
+*     3. This notice may not be removed or altered from any source distribution.
+*
+
+**********************************************************************************************/
+
+// dear imgui: Platform Backend for Raylib
+// (Info: Raylib is a cross-platform general purpose library for handling windows, inputs, graphics context creation, etc. using OpenGL)
+// This is is the low level ImGui backend for raylib, a higher level API that matches the raylib API can be found in rlImGui.h
+
+// You can use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this.
+// Prefer including the entire imgui/ repository into your project (either as a copy or as a submodule), and only build the backends you need.
+// Learn about Dear ImGui:
+// - FAQ                  https://dearimgui.com/faq
+// - Getting Started      https://dearimgui.com/getting-started
+// - Documentation        https://dearimgui.com/docs (same as your local docs/ folder).
+// - Introduction, links and more at the top of imgui.cpp
+
+#pragma once
+#include "imgui.h"      // IMGUI_IMPL_API
+#ifndef IMGUI_DISABLE
+
+IMGUI_IMPL_API bool ImGui_ImplRaylib_Init(void);
+IMGUI_IMPL_API void ImGui_ImplRaylib_Shutdown(void);
+IMGUI_IMPL_API void ImGui_ImplRaylib_NewFrame(void);
+IMGUI_IMPL_API void ImGui_ImplRaylib_RenderDrawData(ImDrawData* draw_data);
+IMGUI_IMPL_API bool ImGui_ImplRaylib_ProcessEvents(void);
+
+#endif // #ifndef IMGUI_DISABLE