{"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-zil7l63b","versions":[{"created_at":"2026-06-10T13:25:42Z","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":"16e62788092d854aa98e0e9762a9ecadb7e3129f2922b77239550c44d3dbd908","version":10},{"created_at":"2026-06-10T11:10:10Z","element_count":84,"note":"5軸GA polish 60->98 by M5 (autonomous)","saved_by":"mcp","sha256":"97662bd541640e3bbf61ea25f16b159d6c0164d97e952931713f3f84652b270c","version":3}]}