Grunt command executed through Ant has slightly mangled output - node.js

Question

I have the following Ant build.xml script, which runs npm install and then grunt (this is a proof of concept to check if we can integrate grunt into our product through Ant, as a stopgap until we can add integrated support):
<project name="GruntTest" default="buildGrunt">
<description>Run Grunt as a test</description>
<!-- ************************************************************** -->
<!-- buildDemo : define the sequence of programs to be executed -->
<!-- ************************************************************** -->
<target name="buildGrunt" depends="runNpm">
<exec executable="cmd">
<arg value="/c grunt"/>
</exec>
</target>
<target name="runNpm" depends="copySourceToTarget">
<exec executable="cmd">
<arg value="/c npm install"/>
</exec>
</target>
<!-- ************************************************************** -->
<!-- Copy all 'txt' files from the source to the target -->
<!-- end rename the extension to 'text' -->
<!-- ************************************************************** -->
<target name="copySourceToTarget">
<copy todir="${target}" includeEmptyDirs="true">
<fileset dir="${source}" includes="*.*"/>
</copy>
<copy todir="${target}/src/test" includeEmptyDirs="true">
<fileset dir="${source}/src/test" includes="*.*"/>
</copy>
<copy todir="${target}/src/server" includeEmptyDirs="true">
<fileset dir="${source}/src/server" includes="*.*"/>
</copy>
</target>
</project>
This is the Gruntfile.js script:
module.exports = function (grunt) {
grunt.initConfig({
pkg: grunt.file.readJSON('package.json'),
uglify: {
options: {
banner: '/*! <%= pkg.name %> <%= grunt.template.today("yyyy-mm-dd") %> */\n',
},
build: {
src: 'src/server/<%= pkg.name %>.js',
dest: 'build/<%= pkg.name %>.min.js'
}
},
nodeunit: {
all: ['src/test/*_test.js']
}
});
grunt.loadNpmTasks('grunt-contrib-uglify');
grunt.loadNpmTasks('grunt-contrib-nodeunit');
grunt.loadNpmTasks('grunt-contrib-jshint');
// Default task(s).
grunt.registerTask('default', ['uglify', 'nodeunit']);
};
This provides the following output to the console when executed from the VScode Terminal:
copySourceToTarget:
[copy] Copying 8 files to E:\ikan\alm\webtest_environments\vs_code\CONTBUILD\BUILD\target\181
[copy] Copied 1 empty directory to 1 empty directory under E:\ikan\alm\webtest_environments\vs_code\CONTBUILD\BUILD\target\181
[copy] Copying 1 file to E:\ikan\alm\webtest_environments\vs_code\CONTBUILD\BUILD\target\181\src\test
[copy] Copying 1 file to E:\ikan\alm\webtest_environments\vs_code\CONTBUILD\BUILD\target\181\src\server
runNpm:
[exec] added 630 packages in 23.676s
[exec] npm WARN VSCode-Workspace#1.0.0 No repository field.
[exec]
buildGrunt:
[exec] Running "uglify:build" (uglify) task
[exec] >> 1 file created 293 B → 255 B
[exec]
[exec] Running "nodeunit:all" (nodeunit) task
[exec] Testing server_test.js..OK
[exec] >> 3 assertions passed (8ms)
[exec]
[exec] Done.
BUILD SUCCESSFUL
Total time: 27 seconds
If I run grunt directly, it gives the following output:
Running "uglify:build" (uglify) task
>> 1 file created 293 B → 255 B
Running "nodeunit:all" (nodeunit) task
Testing server_test.js..OK
>> 3 assertions passed (8ms)
Done.
As you can see, the uglify task has an arrow which displays properly in the grunt command, but when it's output to the ant output, it displays as B  which is not what I want. I'm not sure what causes this, probably something to do with my console encoding, but I don't know for sure.
Is there a way to make the arrow display properly?