buy/hold keyword exec stack handling

src/propeller/push/interpreter.cljc

@@ -11,6 +11,11 @@
         instruction (first (:exec state))
         literal-type (instructions/get-literal-type instruction)]     ; nil for non-literals
     (cond
+      ;;
+      ;; Catch the trading signal keywords before the other
+      ;; keyword checks.
+      (some #(= instruction %) '(:buy :sell :hold))
+      (state/push-to-stack popped-state :signal instruction)
       ;;
       ;; Recognize functional instruction or input instruction
       (keyword? instruction)