{"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-cdk29a7d","versions":[{"created_at":"2026-07-26T17:38:17Z","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":"aae176f5784cfcb32d2cac6604bc422f0fd0232864b071d0ea3742d8525a0fe7","version":2},{"created_at":"2026-07-26T17:38:15Z","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}]}