~anthropic/claude-sonnet-latest → A (8:2)

Side A performs a substantive architectural refactor of the ranking data model (replacing cached GroupState with derived-on-demand ScopeVotes), removing stale cached invariants and simplifying storage/reducer logic while preserving/updating test coverage across many files. Side B is pure test-infrastructure deduplication (moving duplicated bb helper functions into shared modules) which improves maintainability but has no functional or architectural impact on the actual product.