{"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-07-mb8v4f4s","versions":[{"created_at":"2026-06-10T23:29:46Z","element_count":54,"note":"","saved_by":"mcp","sha256":"a859a7e5e08ed9db0b07d6f702365a540d2eba221dc63337982745f85ab2aabf","version":4}]}