{"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-2sd2qo1w","versions":[{"created_at":"2026-06-10T13:13:39Z","element_count":62,"note":"backfill: 延床=居室床スラブ実面積93.9㎡(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":"14c62ed3f0ead7b8a5297c67030193ec57a977f57282835d0e2ffed07d190c95","version":10},{"created_at":"2026-06-10T09:04:53Z","element_count":74,"note":"5軸GA polish 61->97 by M5 (autonomous)","saved_by":"mcp","sha256":"5a42920aac97ecfa4073093ebfae900ad5926660ddc33c73c5565f1691f9adba","version":2}]}