{"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-5mn235zs","versions":[{"created_at":"2026-06-11T01:38:51Z","element_count":90,"note":"5軸GA polish 47->98 by M5 (autonomous)","saved_by":"mcp","sha256":"b418f3ff01b5f6c3bc55532bafb895afd5a3a314b8ac7ac4303051c74ebfc9da","version":11},{"created_at":"2026-06-10T23:07:42Z","element_count":50,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"eb8ca240d8406b52e33f51b6e488d9afdf3e560a6fb11d47a94c8555788034d5","version":2}]}