[docs] Add human-in-the-loop policy for tool-assisted contributions (#154441) Over the course of 2025, we observed an increase in the volume of LLM-assisted nuisance contributions to the project. Nuisance contributions have always been an issue for open-source projects, but until LLMs, we made do without a formal policy banning such contributions. However, LLMs are here, so we are adopting this policy, abbreviated as "human in the loop", which requires that every contribution has a human author attesting to the value of that contribution, and that it is high enough quality that it is worth the time it takes to review the contribution. This policy evolved over time based on community input from the following Discourse threads and a few area team and LLVM project council meetings: * [Our AI policy vs code of conduct and vs reality](https://discourse.llvm.org/t/our-ai-policy-vs-code-of-conduct-and-vs-reality/88300) * [[RFC] LLVM AI tool policy: start small, no slop](https://discourse.llvm.org/t/rfc-llvm-ai-tool-policy-start-small-no-slop/88476) * [[RFC] LLVM AI tool policy: human in the loop](https://discourse.llvm.org/t/rfc-llvm-ai-tool-policy-human-in-the-loop/89159) --------- Co-authored-by: Hubert Tong <hubert.reinterpretcast@gmail.com> Co-authored-by: maflcko <6399679+maflcko@users.noreply.github.com>
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