{"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-f87red1e","versions":[{"created_at":"2026-07-24T06:20:31Z","element_count":126,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"da6ec0492c9439fbcb687e050f6652d012ef165b3b5b948d43adaf976c79eb32","version":2},{"created_at":"2026-07-24T06:20:14Z","element_count":126,"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}]}