fix(go-sdk): reject unknown report types in TCB validation

Add default case to validateTCB switch to reject unknown report types
instead of silently passing. Unlike Rust's exhaustive match on the
Report enum, Go's string-based switch would skip all checks for any
new or unexpected report type.

Author: Leechael

sdk/go/ratls/ratls.go

@@ -155,6 +155,8 @@ func validateTCB(quote *dcap.Quote) error {
 		if len(quote.Report.Attributes) > 0 && quote.Report.Attributes[0]&0x02 != 0 {
 			return fmt.Errorf("debug mode is not allowed")
 		}
+	default:
+		return fmt.Errorf("unknown report type: %s", quote.Report.Type)
 	}
 	return nil
 }