openai/gpt-chat-latest → B (3:2)

Side B introduces a substantial architectural shift from flat per-scope rankings to a hierarchical `GlobalTree` of `ItemId` nodes, adding canonical URL parsing, breadcrumb navigation, node persistence (`NodeEnsured`), and a new journal worker while updating the UI and state management to use the new model. Side A adds a useful `room create` CLI command and simplifies room handling by removing unused visibility state, but it is a narrower feature and cleanup compared with B's broader, lasting redesign of core data structures and navigation.