python/cpython ? reverse-engineered prompt

Build me the Python programming language from its source code. I want to create a complete, working version of Python 3.15 based on this repository, including the core interpreter and the full standard library.

I noticed the README mentions performance optimizations like PGO and LTO. Please enable those to make the final build as fast as possible. I don't know the specific compiler flags, so just follow the best practices described in the build instructions for an optimized version.

The final output should be an executable that I can install on my machine (Linux, macOS, or Windows) and use from the command line, just like the official Python. Also, make sure you run all the included tests to confirm that the build is stable and working correctly before you finish up.