~anthropic/claude-sonnet-latest → B (3:2)

Side B changes the core ranking algorithm from author-level to per-commit pairwise ranking, fixing a real correctness gap (same-contributor multiple commits were never compared) and adds rollup logic, updated evidence schema, epoch page rendering, and new/updated tests covering the behavior. Side A is a sizable but purely additive UI feature (theme cookie/selector) plus a room-URL helper refactor, useful but narrower in scope and lower architectural impact than B's fix to the ranking/reward mechanism.