Defer Ghostscript runtime checks to final verification.

Keep fail-fast installation checks for Ghostscript command presence, but defer executing Ghostscript until the final verification phase where full runtime dependencies and PATH are in place.

.github/workflows/book-build-baremetal.yml

@@ -617,18 +617,14 @@ jobs:
           Write-Output "📊 Ghostscript version:"
           if (Get-Command gswin64c -ErrorAction SilentlyContinue) {
             Write-Output "Resolved Ghostscript: $((Get-Command gswin64c).Source)"
-            gswin64c --version
+            Write-Output "✅ Ghostscript executable found (runtime check deferred to final verification)"
           } elseif (Get-Command gs -ErrorAction SilentlyContinue) {
             Write-Output "Resolved Ghostscript: $((Get-Command gs).Source)"
-            gs --version
+            Write-Output "✅ Ghostscript executable found (runtime check deferred to final verification)"
           } else {
             Write-Error "❌ Ghostscript executable not found (expected gswin64c or gs)"
             exit 1
           }
-          if ($LASTEXITCODE -ne 0) {
-            Write-Error "❌ Ghostscript verification failed with exit code $LASTEXITCODE"
-            exit 1
-          }
           Write-Output "✅ Ghostscript installation complete"
 
       - name: 📦 Install Visual C++ Redistributable (Windows)