{"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-e1abcw47","versions":[{"created_at":"2026-06-11T00:49:04Z","element_count":70,"note":"5軸GA polish 44->95 by M5 (autonomous)","saved_by":"mcp","sha256":"9ebe84e73d58856f1f60a4975f59eafb51ea027e4785e71ed5c8a3c4fbfcd0af","version":15},{"created_at":"2026-06-10T22:07:17Z","element_count":50,"note":"loop3: 設計時延床 70.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"39a862e13c25bee4ffe9686aadf2eac6beb2b18e1146ce1a6b34e43bd6cb0390","version":2}]}