{"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-r2v52riy","versions":[{"created_at":"2026-06-10T13:16:16Z","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":"f9066206588226dd552ee63f3c3e71aa639233e083590e47636be024d15478f7","version":10},{"created_at":"2026-06-10T09:38:03Z","element_count":72,"note":"5軸GA polish 60->97 by M5 (autonomous)","saved_by":"mcp","sha256":"ac3def35b2dce9f8abc55cad3ec89b3f37493e0463fb4b36aceb21a9fd352484","version":2}]}