{"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-38zy4xv9","versions":[{"created_at":"2026-07-23T19:37:43Z","element_count":86,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"50cbce709ebd598be921d7620820d262838d17d6435f6f08af45f0b1569f47e5","version":2},{"created_at":"2026-07-23T19:37:39Z","element_count":86,"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}]}