{"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-inl8w8qv","versions":[{"created_at":"2026-06-11T01:22:16Z","element_count":91,"note":"5軸GA polish 41->95 by M5 (autonomous)","saved_by":"mcp","sha256":"602077056b1c89ad5646ceeb2b72a7dc5727f0f2edbe822a799e9ae47806fbfc","version":12}]}