ci(windows): wire SignPath test-signing for portable bundle

Add SignPath artifact configuration (windows-portable-v1) signing only the
first-party binaries orca-slicer.exe and OrcaSlicer.dll, plus verification
and inventory scripts. The Windows build job uploads the unsigned portable
bundle, submits it to SignPath (test-signing), verifies the returned
signatures, and rebuilds the installer/zip from the signed binaries.

project-slug matches the SignPath project (OrcaSlicer).

scripts/inventory-authenticode.ps1

@@ -0,0 +1,48 @@
+[CmdletBinding()]
+param(
+    [Parameter(Mandatory = $true)]
+    [ValidateScript({ Test-Path -LiteralPath $_ -PathType Container })]
+    [string]$ArtifactDirectory
+)
+
+$ErrorActionPreference = "Stop"
+
+function Get-RelativePath {
+    param(
+        [Parameter(Mandatory = $true)]
+        [string]$Root,
+
+        [Parameter(Mandatory = $true)]
+        [string]$Path
+    )
+
+    $rootWithSeparator = $Root.TrimEnd([IO.Path]::DirectorySeparatorChar, [IO.Path]::AltDirectorySeparatorChar) + [IO.Path]::DirectorySeparatorChar
+    $rootUri = [Uri]$rootWithSeparator
+    $pathUri = [Uri]$Path
+
+    [Uri]::UnescapeDataString($rootUri.MakeRelativeUri($pathUri).ToString()).Replace("/", [IO.Path]::DirectorySeparatorChar)
+}
+
+$artifactRoot = (Resolve-Path -LiteralPath $ArtifactDirectory).Path
+$binaries = Get-ChildItem -LiteralPath $artifactRoot -Recurse -File |
+    Where-Object { $_.Extension -in @(".exe", ".dll") } |
+    Sort-Object -Property FullName
+
+if (-not $binaries) {
+    Write-Warning "No .exe or .dll files found under '$artifactRoot'."
+    exit 0
+}
+
+$binaries | ForEach-Object {
+    $signature = Get-AuthenticodeSignature -LiteralPath $_.FullName
+
+    [pscustomobject]@{
+        RelativePath = Get-RelativePath -Root $artifactRoot -Path $_.FullName
+        Status = $signature.Status
+        SignatureType = $signature.SignatureType
+        Signer = if ($signature.SignerCertificate) { $signature.SignerCertificate.Subject } else { "" }
+        SignerThumbprint = if ($signature.SignerCertificate) { $signature.SignerCertificate.Thumbprint } else { "" }
+        Timestamped = [bool]$signature.TimeStamperCertificate
+        TimeStamper = if ($signature.TimeStamperCertificate) { $signature.TimeStamperCertificate.Subject } else { "" }
+    }
+} | Format-Table -AutoSize

scripts/verify-authenticode.ps1

@@ -0,0 +1,73 @@
+[CmdletBinding()]
+param(
+    [Parameter(Mandatory = $true)]
+    [ValidateScript({ Test-Path -LiteralPath $_ -PathType Container })]
+    [string]$ArtifactDirectory,
+
+    [string[]]$Files = @(
+        "orca-slicer.exe",
+        "OrcaSlicer.dll"
+    ),
+
+    [string]$SignToolPath
+)
+
+$ErrorActionPreference = "Stop"
+
+function Resolve-SignToolPath {
+    param(
+        [string]$ExplicitPath
+    )
+
+    if ($ExplicitPath) {
+        if (Test-Path -LiteralPath $ExplicitPath -PathType Leaf) {
+            return (Resolve-Path -LiteralPath $ExplicitPath).Path
+        }
+
+        throw "SignTool was not found at '$ExplicitPath'."
+    }
+
+    $fromPath = Get-Command -Name "signtool.exe" -ErrorAction SilentlyContinue
+    if ($fromPath) {
+        return $fromPath.Source
+    }
+
+    $candidateRoots = @(
+        "${env:ProgramFiles(x86)}\Windows Kits\10\bin",
+        "${env:ProgramFiles}\Windows Kits\10\bin"
+    ) | Where-Object { $_ -and (Test-Path -LiteralPath $_ -PathType Container) }
+
+    foreach ($root in $candidateRoots) {
+        $candidate = Get-ChildItem -LiteralPath $root -Recurse -Filter "signtool.exe" -File -ErrorAction SilentlyContinue |
+            Where-Object { $_.FullName -match "\\(x64|arm64)\\signtool\.exe$" } |
+            Sort-Object -Property FullName -Descending |
+            Select-Object -First 1
+
+        if ($candidate) {
+            return $candidate.FullName
+        }
+    }
+
+    throw "signtool.exe was not found. Install the Windows SDK or pass -SignToolPath."
+}
+
+$artifactRoot = (Resolve-Path -LiteralPath $ArtifactDirectory).Path
+$signtool = Resolve-SignToolPath -ExplicitPath $SignToolPath
+
+Write-Host "Using SignTool: $signtool"
+Write-Host "Verifying Authenticode signatures in: $artifactRoot"
+
+foreach ($relativePath in $Files) {
+    $filePath = Join-Path $artifactRoot $relativePath
+    if (-not (Test-Path -LiteralPath $filePath -PathType Leaf)) {
+        throw "Expected signed file was not found: $filePath"
+    }
+
+    Write-Host "Verifying $relativePath"
+    & $signtool verify /pa /all /tw /v $filePath
+    if ($LASTEXITCODE -ne 0) {
+        throw "SignTool verification failed for '$relativePath' with exit code $LASTEXITCODE."
+    }
+}
+
+Write-Host "Authenticode verification passed."