openai/gpt-chat-latest → B (4:1)

Side B introduces a substantial architectural shift from string-based scopes to hierarchical `ItemId`/`GlobalTree` state, adds persistent node registration, canonical Reddit URL parsing, breadcrumb navigation, entity support scaffolding, and rewires voting and UI around the new model. Side A is a valuable bugfix that restores OAuth end-to-end tests by fixing mock HTTP handling (`getRequestBody`, redirect responses, null checks, query parsing) and improving test selectors, but its impact is primarily limited to test infrastructure rather than the project's core design.