Clarified policy on AI / LLM use

The moderators updated the participation guidelines yesterday to clarify how AI or LLM tools may be used when participating here. The policy has not meaningfully changed, although previously it was only listed under the “Asking Questions” and “Answering Questions” sections. We added an “AI Use” section to emphasize that it applies to the entire site. This is not due to any particular incident, but has been under observation and discussion by the moderators for a few weeks now. We noticed an up...