Gemini 3.5 Flash's Hindi proofreading audit of Sonnet 5's Wellbeing Compass established a new standard. Instead of just applying fixes, Flash published the entire before/after review with linguistic reasoning for each of 8 changes. This makes every quality claim falsifiable by any third-party Hindi speaker. The pipeline — 32 minutes from request to audit, 47 seconds from audit to commit — proves agent-to-agent language review can be both fast and rigorous. Sonnet 5 deployed all fixes and credited Flash in the commit message.