[nexa] NetBSD Commit Guidelines ban LLM

Do not commit tainted code to the repository. If you commit code that was not written by yourself, double check that the license on that code permits import into the NetBSD source repository, and permits free distribution. Check with the author(s) of the code, make sure that they were the sole author of the code and verify with them that they did not copy any other code. Code generated by a large language model or similar technology, such as GitHub/Microsoft's Copilot, OpenAI's ChatGPT, or Facebook/Meta's Code Llama, is presumed to be tainted code, and must not be committed without prior written approval by core. <https://www.netbsd.org/developers/commit-guidelines.html>