{"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-d6471xi5","versions":[{"created_at":"2026-08-02T17:50:47Z","element_count":119,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"dce7cbb18248f3333b84146e823e1a841624f4475a010563b0edef1e885468fa","version":2},{"created_at":"2026-08-02T17:50:47Z","element_count":119,"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}]}