{"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-d4u48223","versions":[{"created_at":"2026-07-28T06:32:10Z","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":"bf9b5efe47b3c7f974bc50fb324ef3d1545d4a1c4d1001374c8fdfb9ff8142df","version":2},{"created_at":"2026-07-28T06:32:09Z","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}]}