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

B adds a genuine new capability (RoomList RPC + CLI subcommand) with real access-control semantics (per-user grant filtering) plus a thorough integration test proving isolation, giving durable end-user and security value. A is a solid internal tooling improvement (faster scan, better error surfacing, ingest replay) but is more niche dev-tooling churn without new user-facing functionality or security-relevant guarantees.