{"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-nta8263f","versions":[{"created_at":"2026-06-11T03:57:16Z","element_count":72,"note":"5軸GA polish 40->92 by M5 (autonomous)","saved_by":"mcp","sha256":"75680f052f5bfbbb96a123be75b6051269afa0a84a441f746155f52c616c783d","version":3},{"created_at":"2026-06-11T03:53:22Z","element_count":119,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"32eb96579465608d52345e9ebad5ea11af8a18f6858629d636ed998d2923345d","version":2}]}