test: verify and document desktop ui

scripts/start-javis-gui.ps1

@@ -0,0 +1,20 @@
+[CmdletBinding()]
+param(
+    [string]$UvPath,
+    [string]$OllamaPath,
+    [string]$OllamaModels,
+    [string]$DataDir,
+    [string]$UvCacheDir,
+    [string]$PythonInstallDir
+)
+
+$ErrorActionPreference = 'Stop'
+$env:JAVIS_START_INTERFACE = 'gui'
+
+$sharedStarter = Join-Path $PSScriptRoot 'start-javis.ps1'
+if (-not (Test-Path -LiteralPath $sharedStarter -PathType Leaf)) {
+    throw "Das gemeinsame sichere Javis-Startskript wurde nicht gefunden."
+}
+
+& $sharedStarter @PSBoundParameters
+exit $LASTEXITCODE