feat: rewrite package to ESM

- Convert source from CJS (export =, import = require) to ESM imports/exports
- Inline is-windows and graceful-fs (trivial for Node >=22.13)
- Replace util.promisify wrapping with direct fs.promises usage
- Update tsconfig to module/moduleResolution "nodenext"
- Add "type": "module" and "exports" field to package.json
- Convert test files to ESM imports
- Remove unused dependencies (graceful-fs, is-windows, cmd-extension, standard, mos)

Author: zkochan

package.json

@@ -2,18 +2,21 @@
   "name": "@zkochan/cmd-shim",
   "version": "8.0.1",
   "description": "Used in pnpm for command line application support",
+  "type": "module",
   "author": {
     "name": "Zoltan Kochan",
     "email": "zoltan.kochan@gmail.com",
     "url": "http://kochan.io"
   },
+  "exports": {
+    ".": "./index.js"
+  },
   "scripts": {
     "clean": "tsc --build --clean",
     "build": "tsc --build --verbose --listEmittedFiles",
     "pretest:unit": "tsc --build test --verbose --listEmittedFiles",
-    "test:unit": "jest",
-    "test": "pnpm run build && standard && pnpm run test:unit && mos test",
-    "md": "mos",
+    "test:unit": "node --experimental-vm-modules node_modules/jest/bin/jest.js",
+    "test": "pnpm run build && pnpm run test:unit",
     "prepublishOnly": "pnpm run build"
   },
   "files": [
@@ -28,38 +31,22 @@
   },
   "license": "BSD-2-Clause",
   "dependencies": {
-    "cmd-extension": "^1.0.2",
-    "graceful-fs": "^4.2.11",
-    "is-windows": "^1.0.2"
+    "cmd-extension": "^1.0.2"
   },
   "devDependencies": {
-    "@types/is-windows": "^1.0.2",
     "@types/jest": "^29.5.14",
     "@types/node": "^18.19.87",
     "jest": "^29.7.0",
     "memfs": "^3.5.3",
-    "mock-fs": "^5.5.0",
-    "mos": "^1.3.1",
-    "mos-plugin-readme": "^1.0.4",
-    "standard": "^14.3.4",
     "tempy": "^1.0.1",
     "typescript": "^4.9.5"
   },
   "engines": {
     "node": ">=22.13"
   },
-  "mos": {
-    "plugins": [
-      "readme"
-    ]
-  },
-  "standard": {
-    "env": {
-      "jest": true
-    }
-  },
   "jest": {
-    "testEnvironment": "node"
+    "testEnvironment": "node",
+    "transform": {}
   },
   "packageManager": "pnpm@11.0.0-beta.2"
 }