{"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-qc5w7j3k","versions":[{"created_at":"2026-07-31T19:31:56Z","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":"d5eec6f474b63aa8ef319fde18bea980271e96c14d6bd00844a89bbb51811a1d","version":2},{"created_at":"2026-07-31T19:31:56Z","element_count":134,"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}]}