{"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-u8v23slk","versions":[{"created_at":"2026-06-11T04:34:27Z","element_count":83,"note":"5軸GA polish 43->95 by M5 (autonomous)","saved_by":"mcp","sha256":"13275435757ca8a018a31990a626c1d60da4fdcf1d663d11febaeab8758634db","version":3},{"created_at":"2026-06-11T04:26:59Z","element_count":88,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"91db2399bf76f0a7a18ade6469238ce7210eb31cc5b1d09872418f371ea7480c","version":2}]}