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

B delivers substantial new functionality (pairwise vote UI with bridge-based pair selection algorithm, edge-history morphing, ItemId normalization for reddit URLs) plus real test infra reuse (extracted mock-reddit helper) and new integration/e2e tests. A is a smaller but genuinely important bugfix (removing a shared sentinel delegate that blocked concurrent human votes) with good targeted tests, but is narrower in scope and lasting impact compared to B's broader feature and architecture contribution.