fix: ship root cjs entry in dual-mode template

Expose index.cjs at package root and include it in published files so require() resolves correctly.

Author: jchip

packages/dual-mode-template/index.cjs

@@ -0,0 +1,17 @@
+"use strict";
+
+// Re-export from the built CJS module
+const mod = require("./dist-cjs/index.cjs");
+
+// Backward compatibility wrapper for default export style
+const defaultExport = mod.default || mod;
+
+function oldExport(...args) {
+  return defaultExport(...args);
+}
+
+module.exports = oldExport;
+Object.assign(module.exports, {
+  default: defaultExport,
+  ...mod
+});

packages/dual-mode-template/package.json

@@ -8,12 +8,12 @@
   },
   "type": "module",
   "types": "dist-cjs/index.d.ts",
-  "main": "dist-cjs/index.cjs",
+  "main": "index.cjs",
   "module": "dist-esm/index.js",
   "exports": {
     ".": {
       "import": "./dist-esm/index.js",
-      "require": "./dist-cjs/index.cjs"
+      "require": "./index.cjs"
     },
     "./package.json": "./package.json"
   },
@@ -23,6 +23,7 @@
     "coverage": "vitest run --coverage"
   },
   "files": [
+    "index.cjs",
     "dist-cjs",
     "dist-esm"
   ],