openai/gpt-chat-latest → A (5:2)

Side A replaces GitHub API-based commit fetching with a deterministic multi-repository Git discovery pipeline, including mirrored repositories, replayable reachability snapshots, patch-ID deduplication, discovery events persisted to the ledger, concurrency/file locking, and extensive real-Git integration and property tests. Side B adds a useful invite system, room audit RPCs, and timeline/UI support, but it also leaves parts incomplete (for example `RoomRevoke` is explicitly unimplemented and invite events are defined but the implementation relies on ephemeral in-memory state), making it a narrower and less foundational contribution.