openai/gpt-chat-latest → B (3:2)

Side B fixes a runtime bug by defining `GITHUB_API_BASE_URL` with a sensible default, preventing a `NameError` during the GitHub OAuth callback when the API base URL was otherwise undefined. Side A improves test maintenance by replacing manually enumerated `:ns-patterns` with a single auto-discovered `^test\..+` suite, reducing future configuration work, but it primarily streamlines test configuration rather than correcting application behavior.