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

B implements a substantive DSL redesign (block-first explanations/bodies) with real parser logic changes, new error messages, added tests for rejecting legacy syntax, and updates across many fixtures/tests to keep the suite consistent — a meaningful, load-bearing feature change. A is a smaller, well-scoped feature (room create CLI command) but also simplifies RoomState to a HashSet, losing per-room visibility tracking, which is a minor regression in extensibility; overall A's scope is narrower and lower-risk but B's work has broader lasting impact on the core DSL contract.