{"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-0dzhj6fb","versions":[{"created_at":"2026-08-01T12:07:28Z","element_count":101,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"24a3d62d14a0c7705eafa7ae5f2912ef9d81bd935e0498271d1d3fe6446ed47a","version":2},{"created_at":"2026-08-01T12:07:26Z","element_count":101,"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}]}