feat: add paired goat care

world/animals/animal_routine_site.gd

@@ -7,6 +7,7 @@ static var _all: Array[AnimalRoutineSite] = []
 @export var site_id: StringName
 @export var display_name := "Animal site"
 @export var species_id: StringName = SimulationIds.SPECIES_GOAT
+@export var resident_animal_id: StringName
 @export var debug_label_enabled := false
 
 
@@ -48,6 +49,13 @@ func supports_species(candidate_species_id: StringName) -> bool:
 	return candidate_species_id == species_id
 
 
+func supports_animal(candidate_animal_id: StringName, candidate_species_id: StringName) -> bool:
+	return (
+		supports_species(candidate_species_id)
+		and (resident_animal_id.is_empty() or resident_animal_id == candidate_animal_id)
+	)
+
+
 func get_routine_position() -> Vector3:
 	return global_position