{"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-y7rhll5c","versions":[{"created_at":"2026-06-11T01:21:55Z","element_count":90,"note":"5軸GA polish 47->98 by M5 (autonomous)","saved_by":"mcp","sha256":"2d46d8d66d546fcbd2d057fbfb8ee6454fbc27ff545b6f1487034a5d2f319166","version":11},{"created_at":"2026-06-10T23:01:02Z","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":"d04270d2a8b5e46e969dcdf19ff6d2f1aef3d415ab609cb221f342fa4eb9bb9a","version":2}]}