{"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-84wefgac","versions":[{"created_at":"2026-06-10T13:24:25Z","element_count":66,"note":"backfill: 延床=居室床スラブ実面積90.0㎡(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":"494805acc41eda6f134370e0d76e0fc0b202a1f6567664b122ca707b691713be","version":10},{"created_at":"2026-06-10T10:53:32Z","element_count":84,"note":"5軸GA polish 60->98 by M5 (autonomous)","saved_by":"mcp","sha256":"bb54376944c0dae69b067696f03f7c9d11c4933e849b43a808e6a90a7503d6ce","version":3}]}