feat(node): ship managed environment startup and USB recovery

apps/node-agent/packaging/postinst

@@ -2,6 +2,7 @@
 set -eu
 case "$1" in
   configure)
+    /usr/bin/python3 -I /usr/lib/mission-core-vesc/clear_runtime_cache.py
     if ! getent passwd mission-core-node >/dev/null; then
       adduser --system --group --home /var/lib/mission-core-node --no-create-home --disabled-login mission-core-node
     fi
@@ -15,6 +16,9 @@ case "$1" in
       systemctl enable mission-core-node.service
       systemctl restart mission-core-node.service
       systemctl try-restart mission-core-realsense.service
+      if [ -f /var/lib/mission-core-node-profiles/vesc/preparation.json ]; then
+        systemctl start mission-core-node-vesc-prepare.service
+      fi
       if [ -f /run/mission-core-node-k1-upgrade-active ]; then
         # A jointly upgraded plugin starts itself after its own configuration.
         # Restore it here only when that package is already configured.