Sections A (β₁ types: Login spot-check + SecureNote/Identity/Card/Key/Totp), B (β₂ surfaces: custom fields, vault settings, generator popover, ⚙ picker), C (cross-cutting: field history, icons, search, sync, Firefox parity). Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>