Add helper script templates and align reference guidance.

Point helper-script generation at shared templates, tighten prefix-based Quadlet handling, and refresh the bundled Quadlet reference formatting.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

references/template/uninstall_template.sh

@@ -0,0 +1,37 @@
+#!/bin/sh
+set -eu
+
+# Stop the reviewed lifecycle unit(s), then remove installed Quadlet unit files.
+# Update the variables and systemctl_cmd() function below before using this template.
+
+SCRIPT_DIR=$(CDPATH= cd -- "$(dirname -- "$0")" && pwd)
+QUADLET_PREFIX='app-'
+QUADLET_TARGET_DIR="${HOME}/.config/containers/systemd"
+LIFECYCLE_UNITS='app-pod.service'
+
+systemctl_cmd() {
+	systemctl --user "$@"
+}
+
+list_quadlet_files() {
+	for ext in container pod network volume build image kube; do
+		for file in "$SCRIPT_DIR"/"$QUADLET_PREFIX"*."$ext"; do
+			[ -e "$file" ] || continue
+			printf '%s\n' "$file"
+		done
+	done | LC_ALL=C sort -u
+}
+
+files=$(list_quadlet_files)
+[ -n "$files" ] || {
+	printf 'No Quadlet files found for prefix %s\n' "$QUADLET_PREFIX" >&2
+	exit 1
+}
+
+for unit in $LIFECYCLE_UNITS; do
+	systemctl_cmd stop "$unit" || true
+done
+
+printf '%s\n' "$files" | while IFS= read -r file; do
+	rm -f -- "$QUADLET_TARGET_DIR/$(basename -- "$file")"
+done