{"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-udlspl4z","versions":[{"created_at":"2026-07-30T07:44:52Z","element_count":86,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"2d25340bafdc46872707045a98e4ee09c4f0e95720ee02b4faef919b48423515","version":2},{"created_at":"2026-07-30T07:44:52Z","element_count":86,"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}]}