Refactor recent gameplay systems after code review

BuildingLogisticsProfile.gd

@@ -0,0 +1,13 @@
+class_name BuildingLogisticsProfile
+extends Resource
+
+# Optional logistics and conversion behavior composed into a building
+# definition. GameState consumes this data generically, so adding another
+# converter does not require another resource-type branch in transport code.
+
+@export var input_buffers: Dictionary = {}
+@export var collected_outputs: PackedStringArray = []
+@export var conversion_input: String = ""
+@export var conversion_output: String = ""
+@export var conversion_rate: float = 0.0
+@export var conversion_yield: int = 1