{"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-20hcxz68","versions":[{"created_at":"2026-06-10T13:11:50Z","element_count":77,"note":"backfill: 延床=居室床スラブ実面積77.3㎡(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":"fda8e0844e872ee07a1763d9bb656605fd2752f99a1b6786c582806b2ca1ef71","version":11},{"created_at":"2026-06-10T08:32:43Z","element_count":72,"note":"5軸GA polish 60->96 by M5 (autonomous)","saved_by":"mcp","sha256":"a9d5884306ffb1b7b01688a1b81ab38757dc3b81337c752a8980b4aeffdcc3ab","version":3}]}