{"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-1l50opsl","versions":[{"created_at":"2026-06-13T19:45:31Z","element_count":71,"note":"5軸GA polish 44->93 by M5 (autonomous)","saved_by":"mcp","sha256":"94bbd47ddc2b0e82b22ad5ef894b10da9c586c45e97e03c8fd41a92d13f9e705","version":3},{"created_at":"2026-06-13T19:41:12Z","element_count":101,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"0e496433edcec3d047886fc619ebded7b00461ecdd29307ba7360a0279cff869","version":2},{"created_at":"2026-06-13T19:41:11Z","element_count":101,"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}]}