openai/gpt-chat-latest → A (5:1)

Side A changes the core ranking algorithm from contributor-level to commit-level, removes the incorrect single-contributor short-circuit, rolls commit scores back up to contributors for payouts, updates evidence/UI to expose per-commit rankings, and adds tests covering the new behavior. Side B adds a substantial Reddit background fetch pipeline with OAuth, rate limiting, and parsing, but it is a new feature with a TODO and less central impact than the fundamental correctness fix to ownership allocation.