fix(create-rstack): preserve Nx template dotenv precedence

packages/create-rstack/template-nx/.env

@@ -0,0 +1,2 @@
+# Let Rstack load environment files for the current command.
+NX_LOAD_DOT_ENV_FILES=false

packages/create-rstack/template-nx/README.md

@@ -25,6 +25,8 @@ Run from the repository root:
 
 Nx discovers projects and tasks from workspace package manifests. Build and test tasks are cached, and dependencies are built first.
 
+The root `.env` disables Nx's environment-file loading so Rstack can load each project's environment files with the correct mode and priority.
+
 Run `pnpm run build` before `pnpm run check`.
 
 Use `pnpm exec nx graph` to explore the project graph.

packages/create-rstack/tests/create.test.ts

@@ -318,6 +318,9 @@ test.each(['turborepo', 'nx'])(
       'apps/web/src/index.tsx',
       'packages/ui/src/button.tsx',
     ]);
+    if (template === 'nx') {
+      await expectFiles(projectDirectory, ['.env', 'tsconfig.base.json']);
+    }
   },
 );