{"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-heglbi9y","versions":[{"created_at":"2026-08-18T07:08:09Z","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":"9b9f631217151ede2c5bc058c5147265d606fe5ba507bc0995dd2bf3df1881be","version":2},{"created_at":"2026-08-18T07:08:09Z","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}]}