{"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-4i832jp2","versions":[{"created_at":"2026-07-25T12:03:55Z","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":"28ca74cab67706b1d6ce74f4d53da0abc3c8110bbd78c56823aea4b396754f12","version":2},{"created_at":"2026-07-25T12:03:51Z","element_count":134,"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}]}