refactor: Remove obsolete top-level BUILD.md

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-# Building the Project with Xcode
-
-This document provides instructions for building the 64k Demo project using Xcode on macOS.
-
-## Prerequisites
-
-- **Xcode:** Ensure you have Xcode installed. You can download it from the Mac App Store.
-- **CMake:** This project uses CMake as its build system. Ensure CMake is installed on your system.
-
-## Build Steps
-
-1.  **Open Terminal:** Navigate to the root directory of the project (`/Users/skal/demo`).
-
-2.  **Create Build Directory:** It is recommended to build out-of-source. Create a build directory:
-    ```bash
-    mkdir build
-    cd build
-    ```
-
-3.  **Configure with CMake for Xcode:** Generate the Xcode project files using CMake. For Xcode, you typically specify the generator as `Xcode`.
-    ```bash
-    cmake .. -G "Xcode"
-    ```
-    This command will configure the project and create an `.xcodeproj` file within the `build` directory.
-
-4.  **Open Xcode Project:** Open the generated `.xcodeproj` file in Xcode:
-    ```bash
-    open YourProjectName.xcodeproj
-    ```
-    (Replace `YourProjectName.xcodeproj` with the actual name of the generated project file, usually `demo.xcodeproj` or similar).
-
-5.  **Build and Run in Xcode:**
-    *   Select your desired target (e.g., `demo64k`, `test_3d_render`).
-    *   Choose a build scheme (e.g., `Debug` or `Release`).
-    *   Click the "Run" button (or press `Cmd+R`) to build and launch the application.
-
-## GPU Performance Capture (Future Task)
-
-To enable future GPU performance analysis, a conditional compilation macro `ENABLE_GPU_PERF_CAPTURE` can be defined. This can be controlled via CMake build types or specific flags when configuring the project:
-
-```bash
-# Example of defining the macro via CMake (add to CMakeLists.txt)
-# if (MY_GPU_PERF_BUILD)
-#   target_compile_definitions(demo64k PRIVATE ENABLE_GPU_PERF_CAPTURE=1)
-# endif
-```
-
-This macro can then be used within the code (e.g., in `gpu.h` or `platform.h`) to conditionally compile performance monitoring or capture code.
-
-## Shader Performance Analysis Task
-
-For detailed shader performance analysis on macOS, **Xcode's Metal debugger** is the recommended tool. A task has been added to `TODO.md` to integrate this into our workflow for future optimization efforts.