Enable snapshot support in run_vm_bios.sh with automatic detection

run_vm_bios.sh

@@ -3,18 +3,34 @@
 # Configuration
 ISO_PATH="${1:-/home/n0va/.local/share/iridium-installer-vm/Fedora.iso}"
 DISK_PATH="${2:-/home/n0va/.local/share/iridium-installer-vm/test-disk.qcow2}"
+SNAPSHOT_NAME="clean-state"
 
 if [ ! -f "$ISO_PATH" ]; then
     echo "Error: ISO not found at $ISO_PATH"
     exit 1
 fi
 
+if [ ! -f "$DISK_PATH" ]; then
+    echo "Error: Disk image not found at $DISK_PATH"
+    exit 1
+fi
+
 echo "Starting Iridium VM with BIOS (Legacy) support..."
 echo "ISO: $ISO_PATH"
 echo "Disk: $DISK_PATH"
 
+# Check if snapshot exists
+LOADVM_ARG=""
+if qemu-img info "$DISK_PATH" | grep -q " $SNAPSHOT_NAME$"; then
+    echo "Found snapshot '$SNAPSHOT_NAME', loading..."
+    LOADVM_ARG="-loadvm $SNAPSHOT_NAME"
+else
+    echo "Snapshot '$SNAPSHOT_NAME' not found. Starting from fresh disk state."
+fi
+
 # QEMU Command with BIOS
-# Using -device ide-cd for better compatibility in some environments
+# Note: For snapshots to work reliably, all writable disks must be qcow2.
+# The ISO is raw but readonly=on, which is compatible.
 qemu-system-x86_64 \
     -enable-kvm \
     -m 8G \
@@ -30,4 +46,5 @@ qemu-system-x86_64 \
     -vga virtio \
     -display gtk,gl=on \
     -monitor unix:$HOME/.local/share/iridium-installer-vm/monitor.sock,server,nowait \
-    -name "Iridium Installer Test VM (BIOS)"
+    -name "Iridium Installer Test VM (BIOS)" \
+    $LOADVM_ARG