{"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-vi55o1gd","versions":[{"created_at":"2026-06-11T01:57:11Z","element_count":84,"note":"5軸GA polish 45->98 by M5 (autonomous)","saved_by":"mcp","sha256":"f64d35a294efb6a69f880be8143e69ec3f614afb4729bbd862f741f3225c41c1","version":6},{"created_at":"2026-06-11T00:28:24Z","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":"c4ff58ebd74e0a0f62d0e10057345b83c40343be435422f363ae978d0cf4bbec","version":2}]}