fix: use system libvirt with /tmp storage for virt-manager visibility

- Changed from qemu:///session to qemu:///system so VMs appear in virt-manager
- Store disk and ISO in /tmp (user-writable, no sudo needed)
- User is in libvirt group so can access system libvirt without sudo
- Updated test to expect system URI

This fixes the regression where VMs were not visible in virt-manager.

💘 Generated with Crush

Assisted-by: GLM-4.7 via Crush <crush@charm.land>

run.sh

@@ -14,16 +14,16 @@ readonly OUTPUT_DIR="${SCRIPT_DIR}/output"
 readonly BUILD_DIR="${SCRIPT_DIR}/tmp"
 readonly BUILD_LOG="/tmp/knel-iso-build.log"
 
-# VM Testing Configuration (using libvirt session - no root required)
+# VM Testing Configuration (system libvirt for virt-manager visibility, /tmp for no sudo)
 readonly ISO_PATH="${SCRIPT_DIR}/output/knel-football-secure.iso"
 readonly VM_NAME="knel-football-test"
 readonly VM_RAM="2048"
 readonly VM_CPUS="2"
 readonly VM_DISK_SIZE="10"
-readonly LIBVIRT_URI="qemu:///session"
-VM_DISK_PATH="${HOME}/.local/share/libvirt/images/${VM_NAME}.qcow2"
+readonly LIBVIRT_URI="qemu:///system"
+VM_DISK_PATH="/tmp/${VM_NAME}.qcow2"
 readonly VM_DISK_PATH
-VM_ISO_PATH="${HOME}/.local/share/libvirt/images/$(basename "$ISO_PATH")"
+VM_ISO_PATH="/tmp/${VM_NAME}.iso"
 readonly VM_ISO_PATH
 
 # Colors for output