{"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-a1vj4oio","versions":[{"created_at":"2026-06-10T16:08:46Z","element_count":84,"note":"5軸GA polish 58->98 by M5 (autonomous)","saved_by":"mcp","sha256":"6a5b8fbf0dc160073e9e1b95d9f16df354ab68db1749e8caeac7c479156c0ca1","version":3}]}