spk-compile v2.2.3

Adds bundle phase as the final step in every SmechOS build. Produces /tmp/smechos-packages/*.tar.xz — one archive per spk package (base-system, kernel-modules, firmware, bootloader-grub, qt6, mesa-graphics, kde-frameworks, plasma, plasma-discover, packagekit-spk). Upload these to a GitHub Release and set RELEASE_BASE_URL in spk to make spk install fully functional end-to-end.