fix(jest): Use require.resolve for setupFiles path

Jest 30 fails to resolve setupFiles paths on certain Node versions.
Using require.resolve gives Jest an absolute path at config load time.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: romtsn

jest.config.js

@@ -1,7 +1,7 @@
 module.exports = {
   collectCoverage: true,
   testEnvironment: 'node',
-  setupFiles: ['./setupTests.js'],
+  setupFiles: [require.resolve('./setupTests.js')],
   testPathIgnorePatterns: ['./src/', './tests/integration/'],
   transform: {
     '^.+\\.ts$': 'ts-jest',