diff --git a/tests/TokenRightProbe.Feasibility.ps1 b/tests/TokenRightProbe.Feasibility.ps1
index 86a13920..574d1158 100644
--- a/tests/TokenRightProbe.Feasibility.ps1
+++ b/tests/TokenRightProbe.Feasibility.ps1
@@ -14,6 +14,31 @@ $guid='0CCE924A-69AE-11D9-BED3-505054503030';$auth='0CCE9231-69AE-11D9-BED3-5050
 $path='HKLM:\SYSTEM\CurrentControlSet\Control\Lsa';$name='SCENoApplyLegacyAuditPolicy'
 $beforeMasks=Get-WelaEffectiveAuditPolicy;$masks=Masks;$beforePrecedence=Get-WelaRegistryState $path $name;$beforeToken=[Wela.WmiProbe.Native]::Snapshot();$failure=$null;$errors=@()
 Save 'original.json' @{Masks=$beforeMasks;Precedence=$beforePrecedence;Token=$beforeToken;Head=$env:GITHUB_SHA;Engine=$PSVersionTable.PSVersion.ToString()}
+Add-Type -TypeDefinition @'
+using System;using System.IO;using System.Text;using System.Threading.Tasks;
+public static class WelaTokenFixturePipe {
+ public static async Task<string> Read(TextReader reader) {
+  var text=new StringBuilder();var buffer=new char[2048];while(true){int n=await reader.ReadAsync(buffer,0,buffer.Length).ConfigureAwait(false);if(n==0)return text.ToString();if(n>1048576-text.Length)throw new InvalidDataException("Fixture output exceeded one Mi characters.");text.Append(buffer,0,n);}
+ }
+}
+'@
+function Worker([string]$Phase,[string]$Receipt){
+ $all=@('-NoLogo','-NoProfile','-NonInteractive','-File',$worker,$repo,$Receipt)
+ foreach($a in $all){if($a.Contains('"') -or $a.EndsWith('\') -or $a -match '[\x00-\x1f]'){throw 'Ambiguous fixture argument.'}}
+ $info=[Diagnostics.ProcessStartInfo]::new();$info.FileName=(Get-Process -Id $PID).Path;$info.Arguments=(@($all|ForEach-Object{'"'+$_+'"'}) -join ' ');$info.UseShellExecute=$false;$info.CreateNoWindow=$true;$info.RedirectStandardOutput=$true;$info.RedirectStandardError=$true
+ $process=[Diagnostics.Process]::new();$process.StartInfo=$info;$started=$false
+ try{
+  if(-not $process.Start()){throw 'Owned worker did not start.'};$started=$true
+  $stdout=[WelaTokenFixturePipe]::Read($process.StandardOutput);$stderr=[WelaTokenFixturePipe]::Read($process.StandardError)
+  if(-not $process.WaitForExit(90000)){throw 'Owned worker exceeded90seconds.'}
+  if(-not [Threading.Tasks.Task]::WaitAll([Threading.Tasks.Task[]]@($stdout,$stderr),5000)){throw 'Owned worker drain exceeded5seconds.'}
+  [IO.File]::WriteAllText((Join-Path $root ($Phase+'-worker.txt')),$stdout.Result+"`n"+$stderr.Result)
+  if($process.ExitCode -ne 0){throw 'Owned native worker failed; see retained output.'}
+ }finally{
+  if($started){$exited=$false;try{$exited=$process.HasExited}catch{$script:errors+=$_.ToString()};if(-not $exited){try{$process.Kill()}catch{$script:errors+=$_.ToString()};try{$exited=$process.WaitForExit(5000)}catch{$script:errors+=$_.ToString()}};if(-not $exited){$script:errors+='Owned worker termination unconfirmed.'}}
+  try{$process.Dispose()}catch{$script:errors+=$_.ToString()}
+ }
+}
 $worker=Join-Path $root 'worker.ps1';$receipt=Join-Path $root 'worker.json'
 @'
 param($Repo,$Result)
@@ -39,9 +64,7 @@ try{
   foreach($entry in $beforeMasks.Keys){$expected=$beforeMasks[$entry];if($entry -eq $guid){$expected=$phase.Token};if($entry -eq $auth){$expected=$phase.Authorization};if($prepared[$entry] -ne $expected){throw 'Prepared native policy differs from the exact selected two-mask change.'}}
   Save ($phase.Name+'-prepared.json') @{Phase=$phase;Masks=$prepared;Precedence=Get-WelaRegistryState $path $name}
   $receipt=Join-Path $root ($phase.Name+'-worker.json')
-  $engine=(Get-Process -Id $PID).Path
-  & $engine -NoLogo -NoProfile -NonInteractive -File $worker $repo $receipt
-  if($LASTEXITCODE -ne 0){throw 'Native worker failed.'}
+  Worker $phase.Name $receipt
   $result=Get-Content -Raw $receipt|ConvertFrom-Json
   $exactStart=[DateTime]::FromFileTimeUtc($result.Outcome.DisableStartedFileTime);$exactEnd=[DateTime]::FromFileTimeUtc($result.Outcome.RestoreReturnedFileTime)
   $start=$exactStart.AddSeconds(-2);$end=$exactEnd.AddSeconds(2)
@@ -52,8 +75,9 @@ try{
    try{
     $nativeQuery=[System.Diagnostics.Eventing.Reader.EventLogQuery]::new('Security',[System.Diagnostics.Eventing.Reader.PathType]::LogName,$query)
     $reader=[System.Diagnostics.Eventing.Reader.EventLogReader]::new($nativeQuery)
+    $statuses=@($reader.LogStatus);if($statuses.Count -ne 1 -or $statuses[0].LogName -cne 'Security' -or $statuses[0].StatusCode -ne 0){throw 'Native query lacks exactly one successful Security channel status.'}
     $count=0
-    while($null -ne ($event=$reader.ReadEvent())){
+    while($null -ne ($event=$reader.ReadEvent([TimeSpan]::FromSeconds(2)))){
      try{
       $count++;if($count -gt 512){throw 'Diagnostic candidate count exceeded512.'}
       $raw=$event.ToXml();if($raw.Length -gt 65536){throw 'Candidate XML exceeded64Ki characters.'}
@@ -82,9 +106,12 @@ try{
 }catch{$failure=$_.ToString();throw}finally{
  foreach($restoreGuid in @($guid,$auth)){try{Set-WelaEffectiveAuditPolicy -Guid $restoreGuid -Mask $beforeMasks[$restoreGuid] -Mode exact}catch{$errors+=$_.ToString()}}
  try{if($beforePrecedence.ValueExists){Set-ItemProperty -LiteralPath $path -Name $name -Value $beforePrecedence.Value -Type $beforePrecedence.Type}else{Remove-ItemProperty -LiteralPath $path -Name $name -ErrorAction Stop}}catch{$errors+=$_.ToString()}
- $afterToken=[Wela.WmiProbe.Native]::Snapshot();$afterPrecedence=Get-WelaRegistryState $path $name
- $complete=$errors.Count -eq 0 -and (Masks) -ceq $masks -and (Key $afterPrecedence) -ceq (Key $beforePrecedence) -and ((Key $beforeToken) -ceq (Key $afterToken))
- Save 'cleanup.json' @{Complete=$complete;Errors=$errors;Failure=$failure;AfterToken=$afterToken;AfterMasks=Get-WelaEffectiveAuditPolicy;AfterPrecedence=$afterPrecedence}
+ $afterToken=$null;$afterPrecedence=$null;$afterMasks=$null;$afterMaskKey=$null
+ try{$afterToken=[Wela.WmiProbe.Native]::Snapshot()}catch{$errors+=$_.ToString()}
+ try{$afterPrecedence=Get-WelaRegistryState $path $name}catch{$errors+=$_.ToString()}
+ try{$afterMasks=Get-WelaEffectiveAuditPolicy;$afterMaskKey=@($afterMasks.Keys|Sort-Object|ForEach-Object{"$_=$($afterMasks[$_])"}) -join ';'}catch{$errors+=$_.ToString()}
+ $complete=$errors.Count -eq 0 -and $afterMaskKey -ceq $masks -and (Key $afterPrecedence) -ceq (Key $beforePrecedence) -and ((Key $beforeToken) -ceq (Key $afterToken))
+ Save 'cleanup.json' @{Complete=$complete;Errors=$errors;Failure=$failure;AfterToken=$afterToken;AfterMasks=$afterMasks;AfterPrecedence=$afterPrecedence}
  if(-not $complete){throw 'Native feasibility fixture cleanup failed.'}
 }
 $global:LASTEXITCODE=0