{"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-d5z2lmvu","versions":[{"created_at":"2026-06-10T14:13:32Z","element_count":91,"note":"5軸GA polish 55->98 by M5 (autonomous)","saved_by":"mcp","sha256":"8093451737d024765f59fa14eb9cfd898895c7928e379ae1261d60e5fbe1805f","version":6}]}