{"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-k1q72vdi","versions":[{"created_at":"2026-06-11T01:05:13Z","element_count":90,"note":"5軸GA polish 45->98 by M5 (autonomous)","saved_by":"mcp","sha256":"cd8aa7db50b5593e84a9df78f2420680430c9810b5bf02520b92769f97fd0c70","version":13},{"created_at":"2026-06-10T22:22:46Z","element_count":44,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"c0206e7d9e8c0fdd7e28d8e87cc9a7c160b1f238b058f5be2796b12983d76ea8","version":2}]}