feat: Visible wizard runs, one-step VM reset and screenshots; skill updates

- scripts/vmreset.sh, vmwatch.sh (wizard in a visible Konsole), vmshot.sh.
- vmstate.sh: DKMS per kernel, DKMS override, headers service, dark LnF, wallpaper, layout backup.
- cmp.sh: also kcminputrc and ksplashrc.
- Skill: pitfalls and checks from testing cachyos-gamescope-boot 0.7.0.

scripts/vmreset.sh

@@ -0,0 +1,45 @@
+#!/bin/bash
+# Reset the test VM to a snapshot and bring it up logged in to Plasma:
+# power off, restore the snapshot (disk + vars.fd), start it, mount the repo
+# on /mnt, set up the test autologin and wait for plasmashell.
+#   scripts/vmreset.sh [run.sh flags...]      e.g. scripts/vmreset.sh --fremont
+# Env: VM_USER / VM_PORT / VM_HOST, SNAPSHOT (ssh-ready),
+#      VM_DIR (where disk.qcow2 lives: this repo if it has one, else ~/vms/cachyos-test),
+#      VM_LOG (QEMU output, default $VM_DIR/vm.log).
+set -euo pipefail
+. "$(dirname "$0")/common.sh"
+repo="$(cd "$(dirname "$0")/.." && pwd)"
+if [[ -z "${VM_DIR:-}" ]]; then
+    if [[ -f "$repo/disk.qcow2" ]]; then VM_DIR="$repo"; else VM_DIR="$HOME/vms/cachyos-test"; fi
+fi
+SNAPSHOT="${SNAPSHOT:-ssh-ready}"
+VM_LOG="${VM_LOG:-$VM_DIR/vm.log}"
+
+if pgrep -f '^qemu-system' >/dev/null; then
+    echo "Powering off the running VM..."
+    vm_ssh sudo systemctl poweroff 2>/dev/null || true
+    for _ in $(seq 60); do pgrep -f '^qemu-system' >/dev/null || break; sleep 2; done
+    pgrep -f '^qemu-system' >/dev/null && { echo "VM didn't shut down; stop it first." >&2; exit 1; }
+fi
+
+echo "Restoring snapshot '$SNAPSHOT' in $VM_DIR..."
+cd "$VM_DIR"
+qemu-img snapshot -a "$SNAPSHOT" disk.qcow2
+cp "vars.$SNAPSHOT.fd" vars.fd
+
+echo "Starting the VM ($*)..."
+nohup ./run.sh "$@" > "$VM_LOG" 2>&1 &
+for _ in $(seq 100); do vm_ssh -o ConnectTimeout=3 true 2>/dev/null && break; sleep 3; done
+vm_ssh true || { echo "No SSH after 5 minutes; see $VM_LOG" >&2; exit 1; }
+
+vm_ssh bash -s << 'REMOTE'
+sudo mount -t 9p -o trans=virtio,version=9p2000.L repo /mnt
+sudo mkdir -p /etc/plasmalogin.conf.d
+printf '[Autologin]\nUser=%s\nSession=plasma.desktop\n' "$USER" | sudo tee /etc/plasmalogin.conf.d/00-test-autologin.conf >/dev/null
+sudo systemctl restart plasmalogin
+for _ in $(seq 40); do pgrep -u "$USER" -x plasmashell >/dev/null && break; sleep 3; done
+sleep 10
+# Windows the snapshot opens at login would cover the screenshots.
+pkill -u "$USER" systemsettings; pkill -u "$USER" cachyos-hello
+pgrep -u "$USER" -x plasmashell >/dev/null && echo "Logged in to Plasma." || { echo "Plasma did not start." >&2; exit 1; }
+REMOTE