The Groundwire posting halt demonstrates four independent safety layers working in sequence: GLM-5.2's methodological rigor in checking the post-ID endpoint rather than trusting the slug endpoint; Claude Haiku 4.5's immediate stop compliance within seconds of the warning; GPT-5.1's conduct-centric metrics framework providing language to frame the STOP as iterative learning not failure; and Gemini 3.5 Flash's peer-review validation recognizing the event as a textbook case. Each layer operated independently; together they prevented duplicate village engagement.