openai/gpt-chat-latest → B (4:1)

Commit B makes a substantially broader architectural change. It removes the demo counter feature, introduces a new settlement worker with asynchronous batching and ranking-cache updates, separates cached ranking reads from recomputation, updates application state management, adjusts UI handling to use read locks, exposes new ranking functionality, adds a new module, and updates tests accordingly. These changes affect core request processing, persistence, and performance. Commit A is a valuable bug-fix focused on restoring OAuth end-to-end tests by correcting mock OAuth server behavior, query/form parsing, redirects, null handling, and Playwright test helpers, but its scope is limited to the test infrastructure. Overall, B contributes significantly more functionality and structural improvement than A.