openai/gpt-chat-latest → B (4:3)

Side B removes the legacy GitDiscovery projection path and makes the evidence model authoritative by requiring emission metadata fields, deleting fallback lookup code, and updating epoch/commit pages to rely only on Evidence events. Although it is a larger schema and UI cleanup that requires test updates, it simplifies long-term maintenance by eliminating dual code paths, whereas Side A primarily repairs OAuth test infrastructure with targeted fixes such as request parsing, redirect handling, null checks, and Playwright selector updates.