~anthropic/claude-sonnet-latest → B (55:45)

Side B ships a real feature (Reddit OAuth linking, UUID-centric identity, private linked-provider display, session/link-conflict handling) with corresponding server, test-harness, and mock-server updates, delivering concrete new user-facing capability. Side A is a large but purely mechanical rename/refactor (CanonicalItemUrl -> ItemId) that preserves existing behavior and even deletes its own planning doc, providing structural cleanup but no new functionality or bugfix of comparable weight.