Add final progression to tiny sword, fixes and tweeks required

docs/gyms/tiny_sword/buildings/castle/castle.gd

@@ -1,20 +1,26 @@
 extends Node2D
 
+const PRESTIGE_GOAL_ID: StringName = &"gold_350k_wood_20k"
+
 @onready var _prestige_panel: PrestigePanel = $PrestigePanel
+@onready var game_state: LevelGameState = find_parent("LevelGameState")
+
 
-# Called when the node enters the scene tree for the first time.
 func _ready() -> void:
-	pass # Replace with function body.
+	if game_state:
+		game_state.goal_completed.connect(_on_goal_completed)
 
 
-# Called every frame. 'delta' is the elapsed time since the previous frame.
-func _process(delta: float) -> void:
-	pass
-
 func _on_area_2d_mouse_entered() -> void:
-	## TODO: remove this comment to enable prestige panel
-	#_prestige_panel.visible = true
-	pass
+	if game_state and game_state.is_goal_completed(PRESTIGE_GOAL_ID):
+		_prestige_panel.visible = true
+
 
 func _on_area_2d_mouse_exited() -> void:
 	_prestige_panel.visible = false
+
+
+func _on_goal_completed(goal_id: StringName) -> void:
+	if goal_id == PRESTIGE_GOAL_ID:
+		# Prestige is now unlocked — panel will show on next hover.
+		pass