openai/gpt-chat-latest → B (5:2)

Side B introduces a substantial architectural evolution from flat string-scoped rankings to a hierarchical ItemId/GlobalTree model, adds canonical URL parsing, breadcrumb navigation, node registration events, and a journal worker while updating state, UI, and tests to support the new design. Side A mainly replaces a deque with an append-only list, removes write-time trimming in favor of query-time capping, bumps the schema version, and adds a targeted test; useful, but much narrower in long-term impact.