{"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-txyzzylj","versions":[{"created_at":"2026-06-10T13:09:24Z","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":"656151ef7b8e5780b92b53ce83df7c894cbc657aff6e6375f3d69c901b5a418b","version":11},{"created_at":"2026-06-10T07:59:07Z","element_count":90,"note":"5軸GA polish 61->98 by M5 (autonomous)","saved_by":"mcp","sha256":"52d486834347c9f7e1826ec60b613d075b74a8182680a320098d823500bad38b","version":2}]}