{"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-o8v2r714","versions":[{"created_at":"2026-07-17T14:13:53Z","element_count":83,"note":"5軸GA polish 42->95 by M5 (autonomous)","saved_by":"mcp","sha256":"813451f3c2af07679b5a6d154b5f6f4d2cca46266e0a09f5f140687f999be21c","version":3},{"created_at":"2026-07-17T13:57:46Z","element_count":103,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"a70e6aee9426a42925e96021f832298c5bbf42914ef593aeeab83b3fac9228c1","version":2},{"created_at":"2026-07-17T13:57:46Z","element_count":103,"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}]}