{"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-0e77zo1u","versions":[{"created_at":"2026-06-10T10:53:44Z","element_count":70,"note":"5軸GA polish 54->96 by M5 (autonomous)","saved_by":"mcp","sha256":"46d1cd3a02bd63aa9940f000a0f62058c23f4a74ebb24204c70f8974039e5c58","version":3}]}