Add currency database, cleanup legacy system

generator/currency_generator.gd

@@ -1,5 +1,5 @@
 class_name CurrencyGenerator
-extends Node
+extends Node2D
 
 ## Handles generator economy behavior:
 ## - automatic production cycles
@@ -18,7 +18,7 @@ signal production_tick(amount: BigNumber, cycle_count: int, total_owned: int)
 const HUGE_COST_EXPONENT: int = 1000000
 
 ## Currency target updated by this generator.
-@export var currency: Resource = GameState.GOLD_CURRENCY
+@export var currency: Resource
 ## Data resource containing balancing values and defaults (required).
 @export var data: CurrencyGeneratorData
 ## Enables per-cycle automatic production when true.
@@ -30,6 +30,8 @@ const HUGE_COST_EXPONENT: int = 1000000
 ## Extra multiplier applied to automatic production output.
 @export var run_multiplier: float = 1.0
 
+
+
 ## True while the pointer is inside the generator Area2D.
 var _mouse_entered: bool = false
 ## Time left until next click/hover grant is allowed.
@@ -82,14 +84,14 @@ var _is_registered: bool = false
 
 ## Resolves and registers this generator state before gameplay updates.
 func _ready() -> void:
+	assert(currency != null, "Currency cannot be null")
+	assert(data != null, "Data cannot be null")
+	
 	_generator_id = _resolve_generator_id()
 	_ensure_registered()
 	cycle_progress_seconds = 0.0
-	if currency == null:
-		push_warning("CurrencyGenerator '%s' has no currency set; defaulting to Gold." % String(name))
-		currency = GameState.GOLD_CURRENCY
-	if data == null:
-		push_error("CurrencyGenerator '%s' is missing CurrencyGeneratorData." % String(name))
+	
+	GameState.generator_state_changed.connect(_on_generated_state_changed)
 
 ## Updates click cooldown/click grants and runs automatic production cycles.
 func _process(delta: float) -> void:
@@ -342,3 +344,10 @@ func _on_area_2d_mouse_entered() -> void:
 ## Area2D callback: pointer exited generator interaction region.
 func _on_area_2d_mouse_exited() -> void:
 	_mouse_entered = false
+
+func _on_generated_state_changed(generator_id: StringName, state: Dictionary) -> void:
+	if generator_id == _generator_id:
+		print(_generator_id)
+		print(state)
+		visible = true
+