{"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-willowbrookhouse-rt0wnfzs","versions":[{"created_at":"2026-08-14T23:13:34Z","element_count":134,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"1ae40b23ac132582470d4fa2881a41e583011f8659d5be2572418b656353c2a6","version":2},{"created_at":"2026-08-14T23:13:34Z","element_count":134,"note":"言葉から生成: LDK+main bedroom+2 kids rooms+bathroom+storage","saved_by":"mcp:create","sha256":"","version":1}]}