{"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-6ecncenr","versions":[{"created_at":"2026-06-13T16:42:45Z","element_count":90,"note":"5軸GA polish 40->94 by M5 (autonomous)","saved_by":"mcp","sha256":"7d48d270f7f067309a232c14a32d503c67e456c585a1092509de5f6fa720b648","version":3},{"created_at":"2026-06-13T16:33:22Z","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":"893d9ebfe65640d2a309532635781319a7bf1481aedc1fa96223e248aa190e1b","version":2},{"created_at":"2026-06-13T16:33:20Z","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}]}