nice-to-have: implement all 6 tier items

- Get-CIJobSummary.ps1: already present with full implementation (marked done)
- Get-BuildArtifacts.ps1: add -JobId/-Commit params; Write-ArtifactManifest writes
  manifest.json (name, size, sha256, commit, jobId) after both Linux and Windows
  artifact collection branches
- Invoke-CIJob.ps1: add -GuestCPU/-GuestMemoryMB params; insert post-clone VMX
  override block (numvcpus/memsize rewrite) before vmrun start; pass -JobId/-Commit
  to Get-BuildArtifacts calls
- Watch-RunnerHealth.ps1: add -GiteaUrl/-GiteaCredentialTarget params; optional
  GET /api/v1/admin/runners check in Running branch warns if 0 online runners
- Install-CIToolchain-WinBuild2025.ps1: fill SHA256 hashes for Python 3.13.3,
  7-Zip 26.01, Node.js 22.14.0, dotnet-install.ps1
- Measure-CIBenchmark.ps1: add deltaKB field (linked-clone disk footprint in KB)
  measured post-clone; added to result object and summary Format-Table

scripts/Invoke-CIJob.ps1

@@ -159,7 +159,17 @@ param(
 
     # Optional webhook URL (Discord/Gitea). When set, a background job fires a
     # [WARNING] once the job has been running for 90 minutes.
-    [string] $WebhookUrl = ''
+    [string] $WebhookUrl = '',
+
+    # Optional per-job VMX CPU and RAM override (default 0 = use template value).
+    # Applied to the linked clone after New-BuildVM.ps1, before vmrun start.
+    # The template VMX is never modified.
+    # Example: -GuestCPU 4 -GuestMemoryMB 8192
+    [ValidateRange(0, 32)]
+    [int] $GuestCPU = 0,
+
+    [ValidateRange(0, 131072)]
+    [int] $GuestMemoryMB = 0
 )
 
 Set-StrictMode -Version Latest
@@ -402,6 +412,28 @@ try {
             -JobId        $JobId `
             -VmrunPath    $VmrunPath
 
+        # ── Optional VMX CPU/RAM override (post-clone, pre-start) ─────────────
+        if ($GuestCPU -gt 0 -or $GuestMemoryMB -gt 0) {
+            Write-Host "[Invoke-CIJob] Applying VMX override: CPU=$GuestCPU, RAM=${GuestMemoryMB}MB"
+            $vmxLines = Get-Content -LiteralPath $cloneVmxPath
+            if ($GuestCPU -gt 0) {
+                if ($vmxLines -imatch '^numvcpus\s*=') {
+                    $vmxLines = $vmxLines -replace '(?i)^numvcpus\s*=.*', "numvcpus = `"$GuestCPU`""
+                } else {
+                    $vmxLines = $vmxLines + "numvcpus = `"$GuestCPU`""
+                }
+            }
+            if ($GuestMemoryMB -gt 0) {
+                if ($vmxLines -imatch '^memsize\s*=') {
+                    $vmxLines = $vmxLines -replace '(?i)^memsize\s*=.*', "memsize = `"$GuestMemoryMB`""
+                } else {
+                    $vmxLines = $vmxLines + "memsize = `"$GuestMemoryMB`""
+                }
+            }
+            Set-Content -LiteralPath $cloneVmxPath -Value $vmxLines -Encoding UTF8
+            Write-Host "[Invoke-CIJob] VMX updated: $cloneVmxPath"
+        }
+
         # ── Phase 3: Start VM ─────────────────────────────────────────────
         Write-Host "`n[Phase 3/6] Starting VM..."
         $startResult = Invoke-VmrunBounded -VmrunPath $VmrunPath `
@@ -546,6 +578,8 @@ try {
                 -SshKnownHostsFile $SshKnownHostsFile `
                 -GuestArtifactPath '/opt/ci/output' `
                 -HostArtifactDir   $jobArtifactDir `
+                -JobId             $JobId `
+                -Commit            $Commit `
                 -IncludeLogs
         } else {
             & "$scriptDir\Get-BuildArtifacts.ps1" `
@@ -553,6 +587,8 @@ try {
                 -Credential        $credential `
                 -GuestArtifactPath 'C:\CI\output\artifacts.zip' `
                 -HostArtifactDir   $jobArtifactDir `
+                -JobId             $JobId `
+                -Commit            $Commit `
                 -IncludeLogs
         }
         Write-JobEvent -Phase 'phase6.artifacts' -Status 'success' -Data @{ dir = $jobArtifactDir }