refactor(Bun > npm + Jest): Jest runs E2E via Babel (uniform TS/ESM), minimal module mapping, dotenvx for envs

- Switched Bun TS runner to Node + tsx with dotenvx wrapping for env loading.
- Replaced Bun E2E runner with Jest using a dedicated jest e2e config
- Resolved CJS/ESM breakages by using Babel transfomer for .ts|.js| in Jest.
- Avoided duplicated module resolution: ignored `.nx/` and `dist/` in Jest.
- Prevented hijacking external `@lit-protocol/*` and only map local packages

Author: Ansonhkg

babel.config.json

@@ -0,0 +1,9 @@
+{
+  "presets": [
+    [
+      "@babel/preset-env",
+      { "targets": { "node": "current" }, "modules": "commonjs" }
+    ],
+    ["@babel/preset-typescript", { "allowDeclareFields": true }]
+  ]
+}

jest.e2e.config.ts

@@ -0,0 +1,56 @@
+import type { Config } from 'jest';
+
+// only map local packages (prevent hijacking external `@lit-protocol/*` packages)
+const localPackages = [
+  'access-control-conditions',
+  'access-control-conditions-schemas',
+  'auth',
+  'auth-helpers',
+  'auth-services',
+  'constants',
+  'crypto',
+  'lit-client',
+  'logger',
+  'networks',
+  'schemas',
+  'types',
+  'wasm',
+  'wrapped-keys',
+  'wrapped-keys-lit-actions',
+];
+
+const config: Config = {
+  testEnvironment: 'node',
+  testMatch: ['<rootDir>/e2e/src/e2e.spec.ts'],
+
+  // Use Babel for everything; simple and robust with TS + ESM
+  transform: {
+    '^.+\\.(ts|tsx|js|mjs)$': 'babel-jest',
+  },
+
+  // Allow transforms for node_modules so ESM deps work
+  transformIgnorePatterns: [],
+
+  // Resolve monorepo packages to sources
+  moduleNameMapper: {
+
+    // Local packages
+    [`^@lit-protocol/(${localPackages.join('|')})/lib/(.*)$`]:
+      '<rootDir>/packages/$1/src/lib/$2',
+    [`^@lit-protocol/(${localPackages.join('|')})(/.*)?$`]:
+      '<rootDir>/packages/$1/src$2',
+  },
+
+  // this is to avoid duplicate module resolution errors
+  // eg.
+  // jest-haste-map: Haste module naming collision: @lit-protocol/crypto
+  // The following files share their name; please adjust your hasteImpl:
+  //   * <rootDir>/packages/crypto/package.json
+  //   * <rootDir>/.nx/cache/10833129804332267556/outputs/dist/packages/crypto/package.json
+  // FAIL  e2e/src/e2e.spec.ts
+  // ● Test suite failed to run
+  //   The name `@lit-protocol/auth` was looked up in the Haste module map. It cannot be resolved, because there exists several different files, or packages, that provide a module for that particular name and platform. The platform is generic (no extension). You must delete or exclude files until there remains only one of these:
+  modulePathIgnorePatterns: ['<rootDir>/.nx/', '<rootDir>/dist/'],
+};
+
+export default config;