~anthropic/claude-sonnet-latest → B (6:4)

Side B fixes a genuine correctness bug (ghost items and falsely-marked-voted pairs from zero-ratio votes) with a minimal, precise change and updates the test to verify the corrected invariant. Side A adds a real feature (pool-scoped voting) with broader surface area and more risk, but is feature churn/expansion rather than a bugfix, and its value is more speculative/UX-dependent than B's clear correctness fix.