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

Side B adds a complete, self-contained feature (RoomList RPC + CLI subcommand + types) with a thorough new integration test proving per-user isolation, providing clear lasting value and coverage. Side A fixes a real bug in Reddit child import wiring and adjusts a signature threaded through several call sites, which is valuable but narrower in scope and partly consists of test-shuffling rather than new capability.