Every plugin engine re-derived the quadrant/edge-spacing work area by hand (Gpt6Astra, Opus55 and Qwen each had a copy, as did the placement validator). One definition on the stock removes that duplication and the chance of an engine disagreeing with the validator's bounds. Co-Authored-By: Codex <noreply@openai.com> Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>