Add missing acquire_lock to 8 scripts across Docker_Essentials, Rsync, Partnership, Old_Arch

docker_container_stop, docker_update, docker_update_remaining — concurrent Docker
operations on the same containers would conflict; now locked.

rsync.sh — two rsync processes running against the same share simultaneously
would produce incomplete or corrupted mirrors; now locked.

partnership_onboard, ssh_setup — one-shot setup scripts that mutate SSH config and
deploy containers; concurrent runs would produce undefined state; now locked.

Old_Arch_Still_Works: arr_cleanup, continuous_scripts_status — legacy scripts still
sourcing load_config.sh; added lock for consistency even in old-arch context.

partnership_manager.sh intentionally left unchanged — it uses a conditional lock
that excludes read-only "check" mode and "offboard" mode (which delegates to
partnership_offboard.sh, which has its own lock).

Docker_Essentials/docker_container_stop.sh

@@ -128,6 +128,8 @@ if [[ "$EUID" -ne 0 ]]; then
     exit 1
 fi
 
+acquire_lock
+
 if ! command -v docker &>/dev/null; then
     error "Docker command not found"
     exit 1

Docker_Essentials/docker_update.sh

@@ -142,6 +142,8 @@ if [[ "$EUID" -ne 0 ]]; then
     exit 1
 fi
 
+acquire_lock
+
 if ! command -v docker &>/dev/null; then
     error "Docker command not found"
     exit 1

Docker_Essentials/docker_update_remaining.sh

@@ -85,6 +85,8 @@ if [[ "$EUID" -ne 0 ]]; then
     exit 1
 fi
 
+acquire_lock
+
 if ! command -v docker &>/dev/null; then
     error "Docker command not found"
     exit 1

Old_Arch_Still_Works/arr_cleanup.sh

@@ -33,6 +33,8 @@ if [[ "$EUID" -ne 0 ]]; then
     exit 1
 fi
 
+acquire_lock
+
 if ! command -v python3 >/dev/null 2>&1; then
     echo "ERROR: python3 not found — required for arr_cleanup" >&2
     exit 1

Old_Arch_Still_Works/continuous_scripts_status.sh

@@ -61,6 +61,8 @@ if [[ "$EUID" -ne 0 ]]; then
     exit 1
 fi
 
+acquire_lock
+
 # detect_hosts() sets MY_ID and aliases all HOST*_WATCHDOG_* arrays
 detect_hosts
 

Partnership/partnership_onboard.sh

@@ -156,6 +156,8 @@ parse_args "${FILTERED_ARGS[@]}"
 # ==============================================================================================
 [[ "$EUID" -ne 0 ]] && { error "Must be run as root"; exit 1; }
 
+acquire_lock
+
 detect_hosts
 
 OWNER_ID="${PARTNERSHIP_OWNER_HOST:-HOST1}"

Partnership/ssh_setup.sh

@@ -66,6 +66,8 @@ if [[ "$EUID" -ne 0 ]]; then
     exit 1
 fi
 
+acquire_lock
+
 validate_unraid_cmd \
     "/usr/local/emhttp/plugins/dynamix/scripts/notify" \
     "" "" \

Rsync/rsync.sh

@@ -163,6 +163,8 @@ if [[ "$EUID" -ne 0 ]]; then
     exit 1
 fi
 
+acquire_lock
+
 validate_unraid_cmd \
     "/usr/local/emhttp/plugins/dynamix/scripts/notify" \
     "" "" \