openai/gpt-5.2-chat → B (4:1)

Side B replaces GitHub API–based commit fetching with a deterministic, replayable multi-repository Git discovery system (mirror cloning, ref-pattern matching, patch identity deduplication, snapshot hashing, file locks) and wires it into emissions with a `GitDiscovery` event and extensive property/stateful tests. Side A is largely an initial seed adding assorted new files (parser, ranking, reducer, UI scaffolding) but without the focused architectural rigor and replay guarantees that Side B introduces for contribution attribution.