{"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-a7271aj5","versions":[{"created_at":"2026-06-11T04:11:12Z","element_count":72,"note":"5軸GA polish 40->92 by M5 (autonomous)","saved_by":"mcp","sha256":"924ace0c92a5ddb697a44a37e6a49d8df454b4633148f6b1e9404e4f87e98603","version":3},{"created_at":"2026-06-11T03:59:11Z","element_count":101,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"735eb358631d6c34e8fa338b1e04f62aeba19b4fe781a5a6cedb919cc3b4b2d5","version":2}]}