openai/gpt-chat-latest → B (4:1)

Side B replaces the URL canonicalization implementation with a new graph- and parser-based architecture, rewires the public registry API to use it, and reorganizes the module structure, representing a foundational redesign of a core subsystem. Side A is a targeted UI simplification that removes the `ExpandNewThreadForm` action and server-renders the collapsed compose/login hint on the home page, which reduces duplication but has a narrower, feature-specific impact.