{"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-a9izi7bm","versions":[{"created_at":"2026-06-20T19:43:29Z","element_count":73,"note":"5軸GA polish 44->95 by M5 (autonomous)","saved_by":"mcp","sha256":"5a492bd6c3d829fa9e853cf24076d4887677ea64211fc2c5919c2aac19f203f0","version":3},{"created_at":"2026-06-20T19:37:37Z","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":"ba3955c2318575f87316d21281969c4b08f974f7ef7b8780c5f41fc8cf2c6902","version":2},{"created_at":"2026-06-20T19:37:35Z","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}]}