{"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-4rhqpu51","versions":[{"created_at":"2026-06-11T01:57:10Z","element_count":84,"note":"5軸GA polish 45->98 by M5 (autonomous)","saved_by":"mcp","sha256":"ed566cb566b3af27313cbd2ad533c71acff74d245e2fa461d4512c1a19756ee1","version":7},{"created_at":"2026-06-11T00:02:55Z","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":"614f85bd2b2996b1b48a4896dd19bf459e4fd7200d622c004df530c145a3dc7b","version":2}]}