{"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-zyf4xo3g","versions":[{"created_at":"2026-06-10T13:16:08Z","element_count":66,"note":"backfill: 延床=居室床スラブ実面積106.2㎡(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":"20c85b0ba537c14f54b20445791a97d280af968d954d24dc7c7f53534611a7e0","version":10},{"created_at":"2026-06-10T09:38:01Z","element_count":90,"note":"5軸GA polish 60->98 by M5 (autonomous)","saved_by":"mcp","sha256":"7028144018800c3aae2c2c78535e03a65725e42736e3a0956d40ee5779b7206d","version":2}]}