{"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-890wnsao","versions":[{"created_at":"2026-06-10T13:19:02Z","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":"1021aed4b61463fa707c8b45b93ce8cc913d2a35615ea53c82e64faab43717a8","version":10},{"created_at":"2026-06-10T10:09:05Z","element_count":73,"note":"5軸GA polish 61->97 by M5 (autonomous)","saved_by":"mcp","sha256":"30234a1eee2792e4b3d2e74f6b9bafdd827f3381b7c4da99e5624ff6255d4498","version":2}]}