{"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-theoldmillhouse-25w0x7bk","versions":[{"created_at":"2026-06-10T13:23:13Z","element_count":63,"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":"19714a66a31496d8878f0bb18b345150f6bf19966123431f10ef268debfa7739","version":10},{"created_at":"2026-06-10T10:37:38Z","element_count":91,"note":"5軸GA polish 43->98 by M5 (autonomous)","saved_by":"mcp","sha256":"2379fbb4259ba723a39fc1cd35b395cd7bac4afdd8efd953db8f894b0f4dd8ce","version":2}]}