{"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-447q4zsj","versions":[{"created_at":"2026-06-11T01:38:55Z","element_count":71,"note":"5軸GA polish 45->97 by M5 (autonomous)","saved_by":"mcp","sha256":"a8a21482db610c6b2d92111574f2b3690beb2fcee15a45ba9b56db6aa2c1b87b","version":9},{"created_at":"2026-06-10T23:23:17Z","element_count":50,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"7e8fe58fb7f4666b59e52e4cf9bb2bd21ea7189758a0977dc33b7d6cc10596a9","version":2}]}