openai/gpt-chat-latest → A (3:2)

Side A fixes a core correctness issue in Reddit imports by introducing `apply_entity_under_parent` so imported listing children are attached directly without `ensure_path` creating incorrect `/comments/...` hierarchy, and it also improves the ranking UI by showing imported child titles instead of raw IDs. It updates the rendering pipeline and adds integration tests covering SSE morphs and children fetch behavior, whereas Side B primarily adds a useful but incremental `RoomList` RPC/CLI feature with access-control tests.