refactor(windows): ensure output redirection for Invoke-LxsSibling and Invoke-LxsScript

windows/lib/common.ps1

@@ -745,7 +745,10 @@ function Invoke-LxsSibling {
     $local = Join-Path $SelfDirectory $name
     if (Test-Path $local) {
         $global:LASTEXITCODE = 0
-        & $local @Arguments
+        # Out-Host, not a bare call: anything the child writes to the success
+        # stream (native command output, for one) would otherwise be collected
+        # into this function's return value alongside the exit code.
+        & $local @Arguments | Out-Host
         return $LASTEXITCODE
     }
 
@@ -765,7 +768,7 @@ function Invoke-LxsSibling {
     Write-LxsOk 'Payload acquired'
     try {
         $global:LASTEXITCODE = 0
-        & $temp @Arguments
+        & $temp @Arguments | Out-Host
         return $LASTEXITCODE
     } finally {
         Remove-Item $temp -Force -ErrorAction SilentlyContinue

windows/lxs.ps1

@@ -224,8 +224,11 @@ function Invoke-LxsScript {
     Write-Host ''
 
     $global:LASTEXITCODE = 0
+    $code = 0
     try {
-        & $target @Arguments
+        # Out-Host keeps the child's success-stream output out of this
+        # function's return value, which must be just the exit code.
+        & $target @Arguments | Out-Host
         $code = $LASTEXITCODE
     } finally {
         if ($temp) { Remove-Item $temp -Force -ErrorAction SilentlyContinue }