{"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-zcqxj2qb","versions":[{"created_at":"2026-06-11T01:05:15Z","element_count":72,"note":"5軸GA polish 45->97 by M5 (autonomous)","saved_by":"mcp","sha256":"ec6d3c523d1e6d13c9e90cc9135adc0508f65cfc8bae77c9543aeab0ceb0bf8f","version":13},{"created_at":"2026-06-10T22:23:38Z","element_count":54,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"0b53aca5439549eb577f27e94cc33f0a2c7ebda18ef27b5e94a3da3075f2338a","version":2}]}