{"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-b7i226rm","versions":[{"created_at":"2026-06-20T19:43:18Z","element_count":91,"note":"5軸GA polish 45->95 by M5 (autonomous)","saved_by":"mcp","sha256":"122b39b997f5a8ef3db37f8f4bd70f73fcfa8fe52248a7fdfcffb19325a54e96","version":3},{"created_at":"2026-06-20T19:36:34Z","element_count":105,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"5634420a0f0b47cc088801afa900a8c90cb84b3b66c8d453c2034e3480c4473d","version":2},{"created_at":"2026-06-20T19:36:29Z","element_count":105,"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}]}