{"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-highbarnethouse-oc2qz502","versions":[{"created_at":"2026-06-10T13:11:02Z","element_count":85,"note":"backfill: 延床=居室床スラブ実面積81.7㎡(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":"27d5c39f29d8a21c254858222794a6bfde74b5537f842d04d6d555940fe60695","version":11},{"created_at":"2026-06-10T08:15:36Z","element_count":91,"note":"5軸GA polish 43->98 by M5 (autonomous)","saved_by":"mcp","sha256":"cec33e8d1186c1f41d801aa4f6242f4b0f384eb9d2bde26471acfac8978052ad","version":2}]}