{"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-b5u4yqm5","versions":[{"created_at":"2026-06-10T13:26:24Z","element_count":77,"note":"backfill: 延床=居室床スラブ実面積97.8㎡(基礎/屋外/ロフト除外)。設備数量/コスト過大の是正","saved_by":"mcp","sha256":"23247ee7df3269cd38fde9a922802476da9ec64f771184abecd2d5c9a93d9625","version":9},{"created_at":"2026-06-10T11:26:47Z","element_count":73,"note":"5軸GA polish 49->97 by M5 (autonomous)","saved_by":"mcp","sha256":"4e7cec43a1ea45c8e566c87ae5234ad8e0a9ba60d4f377574cd26af63b5d8020","version":3}]}