Remove stryker thresholds configuration, add script to fix duplicate projects in solution, and create new solution file for StellaOps.Router with project references.

devops/scripts/fix-duplicate-projects.ps1

@@ -0,0 +1,55 @@
+#!/usr/bin/env pwsh
+# fix-duplicate-projects.ps1 - Remove duplicate project entries from solution file
+
+param(
+    [string]$SlnPath = "src/StellaOps.sln"
+)
+
+$content = Get-Content $SlnPath -Raw
+$lines = $content -split "`r?`n"
+
+$projectNames = @{}
+$duplicateGuids = @()
+$newLines = @()
+$skipNextEndProject = $false
+
+foreach ($line in $lines) {
+    if ($skipNextEndProject -and $line -eq "EndProject") {
+        $skipNextEndProject = $false
+        continue
+    }
+
+    if ($line -match 'Project\(.+\) = "([^"]+)",.*\{([A-F0-9-]+)\}"?$') {
+        $name = $Matches[1]
+        $guid = $Matches[2]
+
+        if ($projectNames.ContainsKey($name)) {
+            $duplicateGuids += $guid
+            Write-Host "Removing duplicate: $name ($guid)"
+            $skipNextEndProject = $true
+            continue
+        } else {
+            $projectNames[$name] = $true
+        }
+    }
+
+    $newLines += $line
+}
+
+# Also remove duplicate GUIDs from GlobalSection
+$finalLines = @()
+foreach ($line in $newLines) {
+    $skip = $false
+    foreach ($guid in $duplicateGuids) {
+        if ($line -match $guid) {
+            $skip = $true
+            break
+        }
+    }
+    if (-not $skip) {
+        $finalLines += $line
+    }
+}
+
+$finalLines | Out-File -FilePath $SlnPath -Encoding UTF8 -NoNewline
+Write-Host "`nRemoved $($duplicateGuids.Count) duplicate projects"