opencv/opencv-python ? reverse-engineered prompt

Build me a Python project that automatically creates and publishes prebuilt OpenCV wheels for pip, including the regular and headless versions, plus the extra contrib versions.

I want it to handle building the binary packages for different operating systems and Python versions, so people can just install cv2 without compiling OpenCV themselves. It should support the usual wheel release flow, versioning, CI builds, and the source build path too, in case someone needs to generate the packages locally. Please make it work cleanly for Linux, Windows, and macOS, and keep the build setup organized so it can produce the four package variants from the same codebase.

If you need to check current build or packaging docs online while setting it up, go ahead.