feat: add versioned simulation state records

world/resource_nodes/ResourceNode.gd

@@ -75,6 +75,20 @@ func extract(requested_amount: float = yield_per_action) -> float:
 			$Visual.visible = false
 	return extracted
 
+func restore_persistent_state(
+	saved_amount: float,
+	saved_reserved_by: int,
+	saved_enabled: bool
+) -> void:
+	amount_remaining = maxf(saved_amount, 0.0)
+	reserved_by = saved_reserved_by if amount_remaining > 0.0 else -1
+	enabled = saved_enabled
+	amount_changed.emit(node_id, amount_remaining)
+	reservation_changed.emit(node_id, reserved_by)
+	if has_node("Visual"):
+		$Visual.visible = not (hide_visual_when_depleted and is_depleted())
+	_update_debug_label()
+
 func _update_debug_label(_a = null, _b = null) -> void:
 	if not has_node("DebugLabel"):
 		return
@@ -92,6 +106,9 @@ static func get_by_id(node_id: StringName) -> ResourceNode:
 			return node
 	return null
 
+static func get_all() -> Array[ResourceNode]:
+	return _all.duplicate()
+
 static func find_available(action: StringName, agent_id: int, from_position: Vector3) -> ResourceNode:
 	var best: ResourceNode
 	var best_dist := INF