~x-ai/grok-latest → B (2:5)

B replaces flat string scopes/GroupMap/settlement with the hierarchical GlobalTree, rich ItemId canonicalization/parents/breadcrumbs, NodeEnsured events, journal worker, and UI wired to tree nodes—core lasting design. A adds a solid RedditBroker (OAuth, rate limits, JSON parse, tests) on that stub, but it is feature work that depends on B’s model rather than reshaping the project.