{"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-yr1xn8al","versions":[{"created_at":"2026-06-10T07:25:47Z","element_count":91,"note":"5軸GA polish 55->98 by M5 (autonomous)","saved_by":"mcp","sha256":"630285fb0bf1ea68668a92c9be11d90fc3dbe82f88bb3e014994ae46d2b4f844","version":2}]}