{"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-zd4j2s9p","versions":[{"created_at":"2026-07-28T06:30:13Z","element_count":90,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"41596a34fdab38824ec62a929b2ada60336b74fa1038d0a8c02e2f9f6c9ec467","version":2},{"created_at":"2026-07-28T06:30:13Z","element_count":90,"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}]}