chore(scripts): archive PowerShell scripts superseded by the Python CLI

Move 16 .ps1 files to scripts/archived/ — they have no live caller:

- 10 pure shims (New-BuildVM, Remove-BuildVM, Cleanup-OrphanedBuildVMs,
  Wait-VMReady, Invoke-RemoteBuild, Get-BuildArtifacts, Watch-DiskSpace,
  Watch-RunnerHealth, Get-CIJobSummary, Invoke-CIJob) that only forwarded
  to `ci_orchestrator`; the live Gitea composite action now calls
  `python -m ci_orchestrator job` directly.
- 6 Phase-C host tools reimplemented natively in Python (Start-BurnInTest
  [+ -Linux], Test-CapacityBurnIn → bench; Test-Smoke → smoke run;
  Validate-HostState → validate host; Set-CIGuestCredential → creds set).

Add scripts/archived/README.md mapping each file to its `ci` replacement,
and exempt scripts/archived/ from the PSScriptAnalyzer lint job.

Kept (still used / not yet ported): Register-CIScheduledTasks,
Backup-CITemplate, Invoke-RetentionPolicy, Set-TemplateSharedFolders,
Test-CIGuestWinRM, the e2e build harnesses, and all template/ guest
provisioning scripts.

scripts/archived/Start-BurnInTest-Linux.ps1

@@ -0,0 +1,73 @@
+#Requires -Version 5.1
+<#
+.SYNOPSIS
+    Wrapper di lancio per Test-CapacityBurnIn.ps1 con il template Linux (LinuxBuild2404).
+
+.DESCRIPTION
+    Esegue il burn-in a 4 job / 3 round contro il repo burnin-dummy su Gitea,
+    usando il template Ubuntu 24.04. Speculare a Start-BurnInTest.ps1 (Windows).
+
+    Prerequisiti:
+      - Repo burnin-dummy su Gitea con build.sh nella root del branch main
+      - Credenziali guest nel Credential Manager target 'BuildVMGuest'
+        (usate per il PAT Gitea; SSH usa chiave F:\CI\keys\ci_linux)
+      - Gitea PAT nel Credential Manager target 'GiteaPAT'
+          New-StoredCredential -Target 'GiteaPAT' -UserName 'ci' -Password '<pat>' -Persist LocalMachine
+      - Template LinuxBuild2404 con snapshot BaseClean-Linux in stato powered-off
+      - VMware Tools attivo nel guest (per auto-detect IP)
+      - build.sh eseguibile (chmod +x) nel repo — oppure viene richiamato via bash
+
+    Esempi di utilizzo:
+        # Run completo (3 round, 4 job paralleli)
+        .\Start-BurnInTest-Linux.ps1
+
+        # Smoke veloce (1 round, 2 job)
+        .\Start-BurnInTest-Linux.ps1 -Rounds 1 -Parallelism 2
+
+        # Build piu' lungo per osservare concorrenza prolungata
+        .\Start-BurnInTest-Linux.ps1 -Rounds 1 -BuildCommand 'sleep 120'
+
+.PARAMETER Rounds
+    Numero di round sequenziali. Default: 3.
+
+.PARAMETER Parallelism
+    Job concorrenti per round. Default: 4.
+
+.PARAMETER BuildCommand
+    Comando da eseguire nel guest come passo build (eseguito via SSH).
+    Default: 'bash build.sh'
+
+.PARAMETER RoundTimeoutMinutes
+    Minuti massimi di attesa per ogni round prima di interrompere i job rimasti.
+    Default: 60.
+#>
+param(
+    [int]    $Rounds              = 3,
+    [int]    $Parallelism         = 4,
+    [string] $BuildCommand        = 'bash build.sh',
+    [int]    $RoundTimeoutMinutes = 60
+)
+
+Set-StrictMode -Version Latest
+$ErrorActionPreference = 'Stop'
+
+$burnInParams = @{
+    RepoUrl               = 'http://10.10.20.11:3100/Simone/burnin-dummy.git'
+    Branch                = 'main'
+    TemplatePath          = '/var/lib/ci/templates/LinuxBuild2404/LinuxBuild2404.vmx'
+    SnapshotName          = 'BaseClean-Linux'
+    CloneBaseDir          = '/var/lib/ci/build-vms/'
+    ArtifactBaseDir       = '/var/lib/ci/artifacts/'
+    GuestCredentialTarget = 'BuildVMGuest'
+    GiteaCredentialTarget = 'GiteaPAT'
+    VmrunPath             = '/usr/bin/vmrun'
+    GuestOS               = 'Linux'
+    BuildCommand          = $BuildCommand
+    Parallelism           = $Parallelism
+    Rounds                = $Rounds
+    RoundTimeoutMinutes   = $RoundTimeoutMinutes
+}
+
+& (Join-Path $PSScriptRoot 'Test-CapacityBurnIn.ps1') @burnInParams
+
+exit $LASTEXITCODE