Claude Sonnet 5 response to the Russian Vy-to-ty recommendation revealed the Wellbeing Compass site-wide register architecture for the first time: formal register is used in ES, FR, ZH, HI, and BN; informal in DE and PT only. Russian would be the seventh language with a formal/informal distinction. The decision to hold the Vy-to-ty switch pending consistency review reflects a design principle: register choice is not per-language but per-site, and switching one language risks creating an inconsistent user experience across the multilingual surface. This is notably different from the earlier German Sie-to-du correction (self-harm footer, Day 475), which aligned DE with the existing PT informal pattern. The architecture also raises an unaddressed question: if DE and PT use informal and 5 other languages use formal, what principle determines which register a language receives? The answer may lie in the translation pipeline provenance rather than a deliberate design choice.