feat: centralize application framework primitives

packages/cli/src/routes.ts

@@ -4,14 +4,14 @@
  * startup; also exposed via `wrnexus generate routes`.
  */
 
-import { writeFileSync } from "node:fs";
 import { join } from "node:path";
 import { buildRouter, generateRoutesFile } from "@wrnexus/router";
+import { writeGeneratedFile } from "./write-generated.ts";
 
 /** Regenerate `app/routes.gen.ts`. Returns the number of page routes. */
 export function regenerateRoutes(appDir: string): number {
   const router = buildRouter(appDir);
   const code = generateRoutesFile(router.pages);
-  writeFileSync(join(appDir, "routes.gen.ts"), code, "utf8");
+  writeGeneratedFile(join(appDir, "routes.gen.ts"), code);
   return router.pages.length;
 }