{"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-9qugls5x","versions":[{"created_at":"2026-06-30T19:37:02Z","element_count":70,"note":"5軸GA polish 44->93 by M5 (autonomous)","saved_by":"mcp","sha256":"72b43ece2a9faff72a7186529ae69f64ae10dc89a67c145f48ca9895774cd289","version":3},{"created_at":"2026-06-30T19:27:41Z","element_count":122,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"76ae889c769425d946fcbf56c213f39dd48ad10b01cb08973f52747ae6195110","version":2},{"created_at":"2026-06-30T19:27:41Z","element_count":122,"note":"言葉から生成: LDK+主寝室+子供室2+浴室+収納","saved_by":"mcp:create","sha256":"","version":1}]}