{"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-theardennesbungalow-xt93sj39","versions":[{"created_at":"2026-06-10T13:23:16Z","element_count":85,"note":"backfill: 延床=居室床スラブ実面積78.3㎡(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":"86e0c22dab5d3f123b683f21a1fe085a4f1558711b30dd74fc06adea7fbb4809","version":10},{"created_at":"2026-06-10T10:37:34Z","element_count":90,"note":"5軸GA polish 43->98 by M5 (autonomous)","saved_by":"mcp","sha256":"3878ec74cc88142ebf486040e65d085960f29bb0995e420791bcbc56b802dfff","version":2}]}