Umbra Studio v0.22.2

Model Installer Hotfix

• Fixed the packaged model-requirements installer resolving ComfyUI beneath
  resources/app/Tools/ComfyUI instead of the portable installation's root
  Tools/ComfyUI folder.
• Added startup diagnostics for missing, quarantined, or non-runnable bundled
  Bun runtimes and missing installer scripts.
• Kept interactively opened Windows installer terminals visible after success,
  cancellation, or failure so errors and exit codes can be read.
• Added a release gate that executes the packaged Windows installer and verifies
  that its resolved model destination is the root ComfyUI installation.