unRAID_Essentials echo/log audit pass + exit traps

Exit traps: resource_watchdog registers/clears trap for stopped containers;
server_reboot registers trap to restart Docker service on abort; system_watchdog
records containers before bulk stop and registers trap to restart if reboot aborts.

echo/log audit: status conclusions, nothing-to-do, and clean-cycle confirmations
→ echo across clear_logs, docker_syslog_filter, mover_stop, php_fpm_max_children,
rsync_stop, user_scripts_stop. resource_watchdog: disabled flag, restore-level
messages, pressure status → echo. system_watchdog: clean-cycle summary → echo.
Manual-Unraid_Essentials.md: added Output Tiers section.

unRAID_Essentials/user_scripts_stop.sh

@@ -172,7 +172,7 @@ FAILED=()
 SKIPPED=()
 
 if [[ ${#PIDS[@]} -eq 0 ]]; then
-    log "No User Script processes running — nothing to do"
+    echo "No User Script processes running — nothing to do"
 else
     warn "${#PIDS[@]} User Script process(es) found"
     echo ""
@@ -232,7 +232,7 @@ echo "$ICON_TIME   Duration: $(format_duration $(( END - START )))"
 echo ""
 
 if [[ ${#PIDS[@]} -eq 0 ]]; then
-    log "No processes were running"
+    echo "No processes were running"
 elif [[ "$DRY_RUN" == true ]]; then
     warn "DRY RUN — would have stopped ${#SKIPPED[@]} process(es): ${SKIPPED[*]}"
 else
@@ -248,7 +248,7 @@ elif [[ ${#FAILED[@]} -gt 0 ]]; then
     notify "User Scripts stop failed on $(hostname) ($MY_ID) — unkillable: ${FAILED[*]}" \
         "User Scripts Stop" "warning"
 else
-    log "$ICON_DONE Status: done ✅"
+    echo "$ICON_DONE Status: done ✅"
 fi
 echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"