{"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-031odj01","versions":[{"created_at":"2026-06-10T13:24:36Z","element_count":44,"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":"8fa7181916736a6dc08aa91f3b071917cc9de85771bbed5a27e6af9d54744210","version":10},{"created_at":"2026-06-10T10:53:17Z","element_count":56,"note":"5軸GA polish 61->92 by M5 (autonomous)","saved_by":"mcp","sha256":"a1d24a1c4a9979728e4622a23b87fe45472e5cbcec6e2e401424b758035d6726","version":3}]}