{"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-ekfj6uya","versions":[{"created_at":"2026-06-10T13:11:46Z","element_count":85,"note":"backfill: 延床=居室床スラブ実面積78.3㎡(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":"86e0c22dab5d3f123b683f21a1fe085a4f1558711b30dd74fc06adea7fbb4809","version":11},{"created_at":"2026-06-10T08:32:25Z","element_count":74,"note":"5軸GA polish 44->97 by M5 (autonomous)","saved_by":"mcp","sha256":"990c7eb8832981551e3b79c71da6108c2b4d2a4185e2a1c4676bd57b326a5ecb","version":3}]}