{"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-ejp9klxv","versions":[{"created_at":"2026-06-10T15:19:17Z","element_count":70,"note":"5軸GA polish 56->96 by M5 (autonomous)","saved_by":"mcp","sha256":"7803e6221988715a098b01b7a48e9c5b9f86f102b710e5e8923e69c256933d49","version":6}]}