{"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-ixfnr3jf","versions":[{"created_at":"2026-08-17T10:27:31Z","element_count":85,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"70c9e8b6dc694674e6cf74cd0d7d0e59bafd85ca67111e5a9c9b02f5a99312f5","version":2},{"created_at":"2026-08-17T10:27:31Z","element_count":85,"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}]}