{"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-22l1o5qp","versions":[{"created_at":"2026-06-19T19:26:48Z","element_count":83,"note":"5軸GA polish 40->94 by M5 (autonomous)","saved_by":"mcp","sha256":"10f0f2b270e74a7f7b9c5664bd234d881c9693b8c06abd7b6cdd84925e72b06e","version":3},{"created_at":"2026-06-19T19:22:07Z","element_count":119,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"8596ad188a271af66628e150c7bff0cdbac1441302f8464fd1151434694a03ab","version":2},{"created_at":"2026-06-19T19:22:04Z","element_count":119,"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}]}