WinDock bundled third-party source offer

The runtime is QEMU 10.0.2-utm. The bundled ARM64 firmware is from the QEMU
10.2.2 source distribution; both source trees are intentionally retained.
Runtime libraries and swtpm sources are included as well.

In compact app builds, archives/WinDock-Sources.tar.xz contains ALL files from
the original upstream archives, repacked without deleting source content.
Use macOS tar or Archive Utility to extract it to a new writable directory;
do not extract inside the signed application. See EXTRACT.md for paths,
checksums, link handling and memory requirements. No source download is needed.

In a development checkout the original upstream archives remain unchanged.

Bundled QEMU source:
  archives/qemu-10.0.2-utm.tar.xz
  SHA-256: f1d7357547a71ae3339a115d5c8f2b72e3b0089531d67c2aca43326d320ac6ca
  Upstream release URL:
  https://github.com/utmapp/qemu/releases/download/v10.0.2-utm/qemu-10.0.2-utm.tar.xz

WinDock changes are limited to the App Group launch bridge recorded under
patches/qemu-10.0.2-utm-windock-appgroup-helper/. The VM argument construction,
Windows installer, firmware, VNC, shared-folder, audio, and clipboard chains
are not part of this engine patch.

See WinDock-EngineBuildRecipe.md for the exact configure and packaging flow.
BUILD-RECIPE.md records the current runtime/firmware mapping. Historical engine
experiments in WinDock-EngineBuildRecipe.md are not the current binary inventory.
