openai/gpt-chat-latest → B (3:2)

Side B replaces GitHub API-based commit discovery with deterministic multi-repository Git snapshotting, including mirror verification, reachability tracking, patch-identity deduplication, concurrency-safe discovery, replayable ledger snapshots, and extensive real-Git/stateful tests. Side A makes a meaningful architectural change by removing persistent Reddit payloads from the event log and introducing ephemeral projection storage with TTL eviction, but B establishes a broader and more durable correctness foundation for contribution attribution across repositories.