feat: event-trigger run logs live value on no-change

Diagnosis aid: when a rule evaluates but doesn't fire, run now prints
'OK: <cmd> = <value> (no change)' so a rule that silently never crosses
its threshold (e.g. wrong sensor in the check command) is visible
instead of just 'evaluated N rule(s)'.

bin/pos-system-event-trigger

@@ -94,6 +94,8 @@ run_rules() {
             fi
         elif [ "$DRY_RUN" -eq 1 ]; then
             log "(dry-run) OK: $RULE_CMD = $VALUE_DISPLAY (no change)"
+        else
+            log "OK: $RULE_CMD = $VALUE_DISPLAY (no change)"
         fi
     done
     if [ "$skipped" -gt 0 ]; then