Full multi-agent audit of all Drizzle repos, service layer, and schema
files. 104 findings across critical/high/medium/low. Three fixes already
committed to backend in 2484150. Top open items: auth 1+3N rowToUser,
chat table-scan, GIN indexes, missing-transaction on money paths.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>