Have orderkit require its part when it loads

Main resolves computed createRequire specifiers at run time, so a computed
require inside a function no longer makes an island; one in module code
still does.

tests/fixtures/node-island/order/node_modules/orderkit/index.js

@@ -1,5 +1,6 @@
 "use strict";
-// Loads its part through a computed specifier, so it runs in a Node island.
+// Loads its part through a computed specifier when it loads, so it runs in
+// a Node island.
 const { createRequire } = require("node:module");
-const parts = ["./thing"].map((p) => createRequire(__filename)(p));
+const parts = [createRequire(__filename)(["./thing"][0])];
 exports.make = () => new parts[0].Thing();