Fix CI: use bundler module resolution instead of ESM package type

The "type": "module" in package.json caused the CJS esbuild bundle to be
parsed as ESM at runtime, breaking require() calls for Node.js built-ins.
Instead, use moduleResolution: "bundler" in tsconfig which resolves ESM
exports fields correctly while keeping the project as CJS. Revert
jest.config.cjs back to jest.config.js.

https://claude.ai/code/session_01QwnXfWH2ELHXvNgijYTeM1

Author: claude

jest.config.cjs jest.config.jsjest.config.cjs renamed to jest.config.js

@@ -3,7 +3,6 @@
   "version": "4.0.0",
   "private": true,
   "description": "Compile SQL to type-safe Go",
-  "type": "module",
   "main": "lib/main.js",
   "scripts": {
     "build": "tsc",

package.json

@@ -1,8 +1,8 @@
 {
   "compilerOptions": {
     "target": "es2022",                        /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019' or 'ESNEXT'. */
-    "module": "node16",                       /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */
-    "moduleResolution": "node16",             /* Specify module resolution strategy. */
+    "module": "esnext",                       /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */
+    "moduleResolution": "bundler",            /* Specify module resolution strategy. */
     "outDir": "./lib",                        /* Redirect output structure to the directory. */
     "rootDir": "./src",                       /* Specify the root directory of input files. Use to control the output directory structure with --outDir. */
     "strict": true,                           /* Enable all strict type-checking options. */