feat: add player resource node harvesting

tests/resource_node_player_parity_test.gd

@@ -0,0 +1,50 @@
+extends SceneTree
+
+var main_scene: Node
+var failures: Array[String] = []
+
+func _initialize() -> void:
+	call_deferred("_run")
+
+func _run() -> void:
+	main_scene = load("res://main.tscn").instantiate()
+	root.add_child(main_scene)
+	await process_frame
+	await physics_frame
+
+	var simulation_manager := main_scene.get_node("SimulationManager")
+	var player := main_scene.get_node("Player")
+	var bush := main_scene.get_node("ResourceNodes/BerryBush_01") as ResourceNode
+	var tree := main_scene.get_node("ResourceNodes/Tree_01") as ResourceNode
+	simulation_manager.set_process(false)
+
+	bush.amount_remaining = 1.0
+	_check(bush.reserve(999), "Player contention setup should reserve the bush")
+	player.global_position = bush.interaction_point.global_position
+	var food_before: float = simulation_manager.village.food
+	player.try_interact()
+
+	_check(is_equal_approx(bush.amount_remaining, 0.0), "Player should deplete the nearby bush")
+	_check(is_equal_approx(simulation_manager.village.food, food_before + 1.0), "Village should receive exactly the bush's remaining food")
+	_check(bush.reserved_by == -1, "Depletion should release the NPC reservation")
+
+	player.global_position = tree.interaction_point.global_position
+	var wood_before: float = simulation_manager.village.wood
+	var tree_before := tree.amount_remaining
+	player.try_interact()
+
+	_check(is_equal_approx(tree.amount_remaining, tree_before - tree.yield_per_action), "Player should extract the tree's configured yield")
+	_check(is_equal_approx(simulation_manager.village.wood, wood_before + tree.yield_per_action), "Village should receive exactly the extracted wood")
+
+	if failures.is_empty():
+		print("[TEST] ResourceNode player parity passed")
+		quit(0)
+		return
+
+	for failure in failures:
+		push_error("[TEST] " + failure)
+	quit(1)
+
+func _check(condition: bool, message: String) -> void:
+	if not condition:
+		failures.append(message)