{"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-14yxm300","versions":[{"created_at":"2026-06-11T01:38:46Z","element_count":84,"note":"5軸GA polish 47->97 by M5 (autonomous)","saved_by":"mcp","sha256":"7b0d2ff7022f8a6f270b55bc108af7f3f026594ca5c7e08e7903a0aee7dffdfb","version":8},{"created_at":"2026-06-10T23:41:03Z","element_count":50,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"d55c68018c27e61b42034cc1f947a98c8dc434de4f06af011395ee009f82da2a","version":2}]}