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/vmwatch.sh

@@ -0,0 +1,32 @@
+#!/bin/bash
+# Like vmrun.sh, but run the wizard in a visible Konsole window inside the
+# guest's Plasma session, so someone at the QEMU window can follow along.
+# Waits for the wizard to finish, then prints its log. The window stays open.
+#   scripts/vmwatch.sh '<menu input>' ["label shown in the window"]
+# Env: VM_USER (theupriser), VM_PORT (2222), VM_HOST (localhost),
+#      GUEST_REPO (/mnt), GUEST_UID (1000), WAIT (seconds, default 1800).
+set -euo pipefail
+. "$(dirname "$0")/common.sh"
+input="${1:?usage: $0 '<menu input>' [label]}"
+label="${2:-Running the wizard}"
+# The guest login shell is fish, so pass values in through the bash script itself.
+{ printf 'input=%q label=%q repo=%q uid=%q wait=%q\n' "$input" "$label" "${GUEST_REPO:-/mnt}" \
+    "${GUEST_UID:-1000}" "${WAIT:-1800}"; cat << 'REMOTE'
+export XDG_RUNTIME_DIR=/run/user/$uid DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/$uid/bus
+[ -x "$repo/setup-gamescope-boot.sh" ] || { echo "$repo/setup-gamescope-boot.sh missing: mount the repo (lost after a reboot)" >&2; exit 1; }
+rm -f /tmp/wizard.done
+{
+    echo '#!/bin/bash'
+    printf 'echo %q; echo %q; sleep 3\n' ">>> $label" ">>> menu input: $input"
+    # shellcheck disable=SC2016
+    printf 'printf %q | %q 2>&1 | tee /tmp/wizard.log\n' "$input" "$repo/setup-gamescope-boot.sh"
+    echo 'touch /tmp/wizard.done'
+} > /tmp/vmwatch-run.sh
+chmod +x /tmp/vmwatch-run.sh
+pkill -u "$USER" -x konsole || true
+systemd-run --user -q konsole --hold -e /tmp/vmwatch-run.sh
+for _ in $(seq $((wait / 2))); do [ -f /tmp/wizard.done ] && break; sleep 2; done
+[ -f /tmp/wizard.done ] || echo "(still running after ${wait}s)"
+sed 's/\x1b\[[0-9;]*m//g' /tmp/wizard.log
+REMOTE
+} | vm_ssh bash -s 2>&1