{"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-t7szjet5","versions":[{"created_at":"2026-06-11T04:11:11Z","element_count":83,"note":"5軸GA polish 40->94 by M5 (autonomous)","saved_by":"mcp","sha256":"b995cf6ca072e688778e45c0390ade5b853d1a7af3009b61fc94aa2e11bdddf1","version":3},{"created_at":"2026-06-11T03:55:23Z","element_count":119,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"d7f6f77ff4629e97e76be652dc4ce20540b4502c80c1b56acc878e0fd53947da","version":2}]}