fix(installer): correct the wizard and shortcut description in the release docs; harden install-policy checks

.github/workflows/packaging-lint.yml

@@ -36,6 +36,8 @@ jobs:
     runs-on: windows-latest
     steps:
       - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        with:
+          persist-credentials: false
       - name: Install the pinned packaging toolchain
         shell: pwsh
         run: |
@@ -43,8 +45,11 @@ jobs:
           dotnet tool install --tool-path $tools wix --version 5.0.2
           if ($LASTEXITCODE -ne 0) { throw 'WiX installation failed.' }
           $tools >> $env:GITHUB_PATH
-          & (Join-Path $tools 'wix.exe') extension add -g WixToolset.UI.wixext/5.0.2 WixToolset.Util.wixext/5.0.2
-          if ($LASTEXITCODE -ne 0) { throw 'WiX extension installation failed.' }
+          $policy = Get-Content -Raw -LiteralPath packaging/windows/install-policy.json | ConvertFrom-Json
+          foreach ($extension in @($policy.extensions)) {
+            & (Join-Path $tools 'wix.exe') extension add -g "WixToolset.$extension.wixext/5.0.2"
+            if ($LASTEXITCODE -ne 0) { throw "WiX extension $extension installation failed." }
+          }
       - name: Build and check non-executable installer fixtures
         shell: pwsh
         run: ./packaging/windows/test-install-policy.ps1 -OutputDirectory (Join-Path $env:RUNNER_TEMP 'craft-install-policy-tests')