{"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-puqxnskf","versions":[{"created_at":"2026-06-10T13:32:30Z","element_count":66,"note":"backfill: 延床=居室床スラブ実面積90.0㎡(基礎/屋外/ロフト除外)。設備数量/コスト過大の是正","saved_by":"mcp","sha256":"57ebd02d02f9209ee9bfeea84080ccb4918a8f16200d723d0cb08de93b08d67a","version":7},{"created_at":"2026-06-10T12:16:02Z","element_count":84,"note":"5軸GA polish 60->98 by M5 (autonomous)","saved_by":"mcp","sha256":"ac2f20ebad1dbdd0f0f8714eff0823ef8e41ebf114bb0038cc59902ac41c38dd","version":3}]}