~anthropic/claude-sonnet-latest → A (6:4)

Side A implements a real new feature end-to-end (room creation RPC, CLI command, docs, tests) and simplifies the data model by removing dead ThreadVisibility complexity, yielding a cleaner and more capable system. Side B is a smaller, more cosmetic UX polish (auth form morphing instead of redirect) that is useful but narrower in scope and lasting impact compared to A's structural feature addition and simplification.