{"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-uopob1il","versions":[{"created_at":"2026-07-26T17:40:39Z","element_count":119,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"ad9fa617c04a04b89518aaaaabba5d4b103d6229611774d40be73b461eb79946","version":2},{"created_at":"2026-07-26T17:40:36Z","element_count":119,"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}]}