{"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-4jt4crfq","versions":[{"created_at":"2026-07-19T17:39:16Z","element_count":83,"note":"5軸GA polish 45->95 by M5 (autonomous)","saved_by":"mcp","sha256":"3db70daf692d56a2cccddd69d06f9b48d8b22e468d13546f4c9edda04e93276b","version":3},{"created_at":"2026-07-19T17:32:55Z","element_count":88,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"fe9e4aa118d92f8666f0ae84809c83b1fa2c31570d7e6eccbc01741517dd5dfa","version":2},{"created_at":"2026-07-19T17:32:55Z","element_count":88,"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}]}