{"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-ti249xyv","versions":[{"created_at":"2026-08-14T14:44:52Z","element_count":119,"note":"loop3: 設計時延床 80.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"a56f7d7976ef3e489eca2228dca68b8c2806bc97138edfa19cd6dd2291fc98a7","version":2},{"created_at":"2026-08-14T14:44:51Z","element_count":119,"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}]}