{"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-r2sahjwk","versions":[{"created_at":"2026-08-17T12:03:00Z","element_count":134,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"868ce811833316c98e70734b7e419c5a47307a93e5945f8830e13adb20fc69e4","version":2},{"created_at":"2026-08-17T12:03:00Z","element_count":134,"note":"言葉から生成: LDK+主寝室+子供室+浴室+収納","saved_by":"mcp:create","sha256":"","version":1}]}