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/vmshot.sh

@@ -0,0 +1,18 @@
+#!/bin/bash
+# Screenshot the guest's Plasma session to a file on the host.
+#   scripts/vmshot.sh <out.png>
+# spectacle started straight from SSH crashes; run it as a user unit so it
+# gets the session's environment.
+# Env: VM_USER (theupriser), VM_PORT (2222), VM_HOST (localhost), GUEST_UID (1000).
+set -euo pipefail
+. "$(dirname "$0")/common.sh"
+out="${1:?usage: $0 <out.png>}"
+{ printf 'uid=%q\n' "${GUEST_UID:-1000}"; cat << 'REMOTE'
+export XDG_RUNTIME_DIR=/run/user/$uid DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/$uid/bus
+rm -f /tmp/vmshot.png
+sleep 2
+systemd-run --user --wait -q spectacle -b -n -f -o /tmp/vmshot.png
+REMOTE
+} | vm_ssh bash -s
+scp -q -P "$VM_PORT" "$VM_USER@$VM_HOST:/tmp/vmshot.png" "$out"
+echo "$out"