{"note":"bim_versions 導入後の保存のみ記録 (それ以前は bim_canonical 上書きで履歴なし)","ok":true,"slug":"u-willowbrookhouse-bone80vf","versions":[{"created_at":"2026-06-13T19:45:22Z","element_count":90,"note":"5軸GA polish 44->98 by M5 (autonomous)","saved_by":"mcp","sha256":"44d7349074360233aefd8d5a18579aa53c6602682ba7440a81079782997da06e","version":3},{"created_at":"2026-06-13T19:18:11Z","element_count":134,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"fe8457843649ecf5cf5101487f2b9903f609def9f3b8b06e617f7ff3763d423e","version":2},{"created_at":"2026-06-13T19:18:08Z","element_count":134,"note":"言葉から生成: LDK+main bedroom+2 kids rooms+bathroom+storage","saved_by":"mcp:create","sha256":"","version":1}]}