{"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-streathamhillsidehou-qlg9udim","versions":[{"created_at":"2026-06-10T13:19:49Z","element_count":85,"note":"backfill: 延床=居室床スラブ実面積81.4㎡(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":"824d7985f1bdd0d20074f7a4c9ddc42144d58b4769be5dfb3559d329b8ba00a8","version":10},{"created_at":"2026-06-10T10:09:28Z","element_count":72,"note":"5軸GA polish 43->97 by M5 (autonomous)","saved_by":"mcp","sha256":"116023d2a5adb695501a1eb378fbc9349c400f459df00f01b9b3507e50071b2a","version":2}]}