feat: introduce identity-backed goat

simulation/actions/ActionSelectionSystem.gd

@@ -23,7 +23,8 @@ func select_action(
 	time_of_day: float = 0.5,
 	all_npcs: Array = [],
 	opportunity_helper: OpportunityHelperResult = null,
-	population_view: SimulationPopulationView = null
+	population_view: SimulationPopulationView = null,
+	animal_feed_name: String = ""
 ) -> ActionSelectionResult:
 	if npc.is_dead:
 		return null
@@ -126,6 +127,14 @@ func select_action(
 		return ActionSelectionResult.new(
 			SimulationIds.ACTION_REST, -1.0, "Energy is below the rest threshold"
 		)
+	if not animal_feed_name.is_empty():
+		var feed_definition := SimulationDefinitions.get_action(SimulationIds.ACTION_FEED_ANIMAL)
+		if _get_cost_rejection(feed_definition, village).is_empty():
+			return ActionSelectionResult.new(
+				SimulationIds.ACTION_FEED_ANIMAL,
+				-1.0,
+				"%s is hungry; pantry food is available" % animal_feed_name
+			)
 	if village.food <= RELATIONSHIP_AID_PANTRY_THRESHOLD and relationship_system != null:
 		var trusted_starving_npc: SimNPC = relationship_system.get_trusted_starving_subject(
 			npc.id, all_npcs, population_view