fix(templates): import PSWSMan module on Linux before New-PSSession

Without Import-Module PSWSMan the native WSMan library isn't registered
and New-PSSession hangs/fails silently. Import guarded by $IsWindows so
Windows PS 5.1 is unaffected.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

template/Prepare-WinBuild2022.ps1

@@ -165,6 +165,12 @@ Set-StrictMode -Version Latest
 $ErrorActionPreference = 'Stop'
 $ProgressPreference   = 'SilentlyContinue'   # suppress Write-Progress (IWR, etc.)
 
+# On Linux, PSWSMan must be imported to register the native WSMan client library.
+# Install once: sudo pwsh -c "Install-Module PSWSMan -Force; Install-WSMan"
+if ($null -ne $IsWindows -and $IsWindows -eq $false) {
+    Import-Module PSWSMan -ErrorAction Stop
+}
+
 function Test-TcpPort {
     param([string]$ComputerName, [int]$Port, [int]$TimeoutMs = 3000)
     try {

template/Prepare-WinBuild2025.ps1

@@ -165,6 +165,12 @@ Set-StrictMode -Version Latest
 $ErrorActionPreference = 'Stop'
 $ProgressPreference   = 'SilentlyContinue'   # suppress Write-Progress (IWR, etc.)
 
+# On Linux, PSWSMan must be imported to register the native WSMan client library.
+# Install once: sudo pwsh -c "Install-Module PSWSMan -Force; Install-WSMan"
+if ($null -ne $IsWindows -and $IsWindows -eq $false) {
+    Import-Module PSWSMan -ErrorAction Stop
+}
+
 function Test-TcpPort {
     param([string]$ComputerName, [int]$Port, [int]$TimeoutMs = 3000)
     try {