feat: finalize with step 5

chapter-2-state-driven-agent-design/westworldwithmessaging/elsa.go

@@ -10,6 +10,11 @@ type Elsa struct {
 	*BaseGameEntity
 
 	stateMachine *StateMachine[Elsa]
+
+	// cooking tracks whether there's already a stew in the oven, so
+	// CookStew.Enter doesn't put a second one in or send a second
+	// reminder message to herself.
+	cooking bool
 }
 
 // NewElsa sets up Elsa's state machine: DoHousework is her ordinary,
@@ -40,6 +45,16 @@ func (e *Elsa) FSM() *StateMachine[Elsa] {
 	return e.stateMachine
 }
 
+// Cooking reports whether there's already a stew in the oven.
+func (e *Elsa) Cooking() bool {
+	return e.cooking
+}
+
+// SetCooking updates whether there's a stew in the oven.
+func (e *Elsa) SetCooking(v bool) {
+	e.cooking = v
+}
+
 // Update satisfies the Entity interface (alongside the ID() method
 // borrowed from BaseGameEntity) and just delegates to the state
 // machine, same shape as Miner.Update.