openai/gpt-chat-latest → A (3:2)

Side A fixes a real functional bug by replacing the bogus `https://.` parent lookup for the external garden index with `external_root_host_items`, ensuring external roots are discovered even from implicit child edges, and adds tests for that behavior. It also introduces a reusable resolver architecture (`server/src/resolvers/`), rich GitHub import card rendering via `render_item_body_in_scope`, and integration/unit tests, whereas Side B is primarily deployment and observability infrastructure (Docker, Fly, GitHub Actions, SSE dashboard, status APIs) that improves operations but less directly changes the project's core behavior.