feat(sprint4-6): quality, reliability, perf baseline

Sprint 4 — qualità codice:
- scripts/_Common.psm1: New-CISessionOption, Resolve-VmrunPath, Invoke-Vmrun
- PSScriptAnalyzerSettings.psd1: project-wide PSSA rules (security + formatting)
- Remove-BuildVM.ps1: SupportsShouldProcess (-WhatIf support)
- Invoke-RemoteBuild.ps1, Get-BuildArtifacts.ps1: use New-CISessionOption from module
- New-BuildVM.ps1: use Resolve-VmrunPath + Invoke-Vmrun from module

Sprint 5 — affidabilità:
- Backup-CITemplate.ps1: stop runner, timestamped VMDK backup, prune old, restart
- Watch-RunnerHealth.ps1: auto-restart act_runner, cooldown 3/h, EventLog + webhook
- Register-CIScheduledTasks.ps1: add CI-RunnerHealth task (every 15 min)

Sprint 6 — perf baseline:
- Set-TemplateSharedFolders.ps1: idempotent VMX editor for NuGet/pip shared folders
- Invoke-RemoteBuild.ps1: -UseSharedCache injects NUGET_PACKAGES + PIP_CACHE_DIR in guest
- Measure-CIBenchmark.ps1: times clone/start/IP/WinRM/destroy, appends to benchmark.jsonl

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

scripts/New-BuildVM.ps1

@@ -58,10 +58,9 @@ param(
 Set-StrictMode -Version Latest
 $ErrorActionPreference = 'Stop'
 
-# --- Validate vmrun.exe ---
-if (-not (Test-Path $VmrunPath -PathType Leaf)) {
-    throw "vmrun.exe not found at: $VmrunPath`nInstall VMware Workstation Pro and update -VmrunPath if needed."
-}
+Import-Module (Join-Path $PSScriptRoot '_Common.psm1') -Force
+
+Resolve-VmrunPath -VmrunPath $VmrunPath | Out-Null
 
 # --- Build clone path ---
 $timestamp  = Get-Date -Format 'yyyyMMdd_HHmmss'
@@ -81,27 +80,17 @@ Write-Host "  Clone VMX : $cloneVmx"
 
 $sw = [System.Diagnostics.Stopwatch]::StartNew()
 
-# --- Run vmrun clone ---
-$vmrunArgs = @(
-    '-T', 'ws',
-    'clone',
-    $TemplatePath,
-    $cloneVmx,
-    'linked',
-    '-snapshot', $SnapshotName
-)
-
-$result = & $VmrunPath @vmrunArgs 2>&1
-$exitCode = $LASTEXITCODE
+$cloneResult = Invoke-Vmrun -VmrunPath $VmrunPath -Operation clone `
+    -Arguments @($TemplatePath, $cloneVmx, 'linked', '-snapshot', $SnapshotName)
 
 $sw.Stop()
 
-if ($exitCode -ne 0) {
+if ($cloneResult.ExitCode -ne 0) {
     # Clean up partial clone directory if it was created
     if (Test-Path $cloneDir) {
         Remove-Item $cloneDir -Recurse -Force -ErrorAction SilentlyContinue
     }
-    throw "vmrun clone failed (exit $exitCode).`nOutput: $result"
+    throw "vmrun clone failed (exit $($cloneResult.ExitCode)).`nOutput: $($cloneResult.Output)"
 }
 
 if (-not (Test-Path $cloneVmx -PathType Leaf)) {