{"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-7alsgvha","versions":[{"created_at":"2026-06-10T13:24:18Z","element_count":63,"note":"backfill: 延床=居室床スラブ実面積93.5㎡(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":"6cd8fd5d9f3ced5a69261474bea6838314f152cd2b77a3e5321b3b038a4f696e","version":10},{"created_at":"2026-06-10T10:53:39Z","element_count":89,"note":"5軸GA polish 55->98 by M5 (autonomous)","saved_by":"mcp","sha256":"60c9a2830f51a4e65d7367eb4f66c019103600b8ba74224d7cfdbac6d57d091a","version":3}]}