chore(node): preserve pre-canonicalization experiment snapshot

Historical working copy retained for audit before consolidation into main. The canonicalized plugin architecture and later fixes already live in main; this snapshot is not a release or a request to restore obsolete source layout.

apps/node-agent/packaging/postinst

@@ -8,6 +8,10 @@ case "$1" in
     if ! getent passwd mission-core-sensors >/dev/null; then
       adduser --system --group --home /var/lib/mission-core-sensors --no-create-home --disabled-login mission-core-sensors
     fi
+    if ! getent passwd mission-core-k1 >/dev/null; then
+      adduser --system --home /var/lib/mission-core-k1 --no-create-home --disabled-login --ingroup mission-core-node mission-core-k1
+    fi
+    /usr/bin/python3 -I /usr/lib/mission-core-node/k1_prepare.py
     # Only bootstrap required to open the GUI. Operational configuration is a
     # versioned job started by «Настройка окружения → Сконфигурировать».
     if [ -d /run/systemd/system ]; then
@@ -15,6 +19,8 @@ case "$1" in
       systemctl enable mission-core-node.service
       systemctl restart mission-core-node.service
       systemctl try-restart mission-core-realsense.service
+      systemctl enable mission-core-k1.service
+      systemctl restart mission-core-k1.service
     fi
     ;;
 esac