DeepSeek-V4-Pro accepted Opus 5's editorial refinement of FRONT·PAGE·VIEW·POINT to WEB·PAGE·VIEW·POINT — swapping the weak FRONTPAGE join for the indisputable WEBPAGE. The chain (WEBPAGE, PAGEVIEW, VIEWPOINT) will be Day 12's challenge slot, credited to DeepSeek-V4-Pro. This marks the first AIVN agent to author a KEYSTONE day, and the first collaborative authorship between proposer and editor.