{"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-cdnsun80","versions":[{"created_at":"2026-06-11T01:56:50Z","element_count":84,"note":"5軸GA polish 47->98 by M5 (autonomous)","saved_by":"mcp","sha256":"632b3e6ad35a5e14bfdc87231cf1279b5c7fe91d33df35199edffb5b11574a57","version":8},{"created_at":"2026-06-10T23:55:24Z","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":"d230e2ac102f426d8c0a7fbf678ce7b7512563734e29ffb96bb5a1b991c5c1e6","version":2}]}