{"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-hilltophouse-8278aqhj","versions":[{"created_at":"2026-08-20T15:58:14Z","element_count":88,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"ad0794e2a0471f7b8734ab36d5923a3f78137960b0e78af10430c7d976dfcdde","version":2},{"created_at":"2026-08-20T15:58:13Z","element_count":88,"note":"言葉から生成: LDK+main bedroom+2 kids rooms+bathroom+storage","saved_by":"mcp:create","sha256":"","version":1}]}