{"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-house-b49y044i","versions":[{"created_at":"2026-07-13T19:41:38Z","element_count":83,"note":"5軸GA polish 42->94 by M5 (autonomous)","saved_by":"mcp","sha256":"ac9e2f123c2514d3c4e8f8367f3e9930d5c0a9c764816b1606656f76bb52d3ea","version":3},{"created_at":"2026-07-13T19:29:01Z","element_count":101,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"8470ac52981f0b81c762d00eba142b16e8d0dc1b48b7044b3f165b9ed6c9412b","version":2},{"created_at":"2026-07-13T19:29:00Z","element_count":101,"note":"言葉から生成: LDK+主寝室+子供室2+浴室+収納","saved_by":"mcp:create","sha256":"","version":1}]}