Add generator buffs (additional test required)

generator/currency_generator_data.gd

@@ -28,6 +28,22 @@ extends Resource
 @export var click_exponent: int = 0
 @export var click_cooldown_seconds: float = 0.2
 
+## Data-driven buffs purchasable for this generator.
+@export var buffs: Array[GeneratorBuffData] = []
+
+func find_buff(buff_id: StringName) -> GeneratorBuffData:
+	var expected_id: String = String(buff_id).strip_edges()
+	if expected_id.is_empty():
+		return null
+
+	for buff in buffs:
+		if buff == null:
+			continue
+		if String(buff.id) == expected_id:
+			return buff
+
+	return null
+
 ## Returns cost of next generator
 func cost_next(owned: int) -> float:
 		return cost_for_amount(owned, 1)