feat: finalize with step 5

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

@@ -26,25 +26,33 @@ func DoHousework() *doHousework {
 var _ State[Elsa] = (*doHousework)(nil)
 
 // chores is our own small stand-in for the book's actual chore list
-// - it only ever showed two examples in its sample output ("Moppin'
-// the floor", "Makin' the bed"), so that's exactly what's reused
-// here. One gets picked at random each tick.
+// - its sample output shows three examples ("Moppin' the floor",
+// "Makin' the bed", "Washin' the dishes"), so that's exactly what's
+// reused here. One gets picked at random each tick.
 var chores = []string{
 	"Moppin' the floor",
 	"Makin' the bed",
+	"Washin' the dishes",
 }
 
-// Enter does nothing - the book's sample output never shows a
-// message when Elsa starts doing housework, only while she's doing
-// it (Execute) and when she leaves the bathroom back into it.
-func (s *doHousework) Enter(e *Elsa) {}
+// Enter announces that Elsa is back to her ordinary routine. A
+// sample run of the book's program shows this line printed right
+// after she finishes cooking and switches back to this state - an
+// earlier, more abridged sample output we saw didn't show this line
+// after a bathroom-break revert, but that sample was explicitly
+// described as just "a sample," not a complete transcript, so this
+// message firing every time Enter runs (bathroom revert included)
+// isn't a contradiction.
+func (s *doHousework) Enter(e *Elsa) {
+	fmt.Printf("\n%s: Time to do some more housework!", GetNameOfEntity(e.ID()))
+}
 
 // Execute announces one randomly chosen chore per tick.
 func (s *doHousework) Execute(e *Elsa) {
 	fmt.Printf("\n%s: %s", GetNameOfEntity(e.ID()), chores[rand.Intn(len(chores))])
 }
 
-// Exit does nothing, for the same reason as Enter.
+// Exit does nothing - no sample output ever shows a message here.
 func (s *doHousework) Exit(e *Elsa) {}
 
 // OnMessage is required now that State[T] includes it, so that every