Background

PR #289 proposed adding ESM support to the Jest configuration to fix CI failures when updating ESM-only dependencies.

Problem

Dependency PRs (chalk 5.x, execa 9.x, commander 14.x, etc.) fail CI because Jest cannot parse ESM-only packages.

Proposed Changes

• jest.config.js: Add transformIgnorePatterns to transform chalk and babel-jest for JS files
• babel.config.js: New Babel config targeting current Node.js for ESM→CJS transformation
• package.json: Add @babel/core, @babel/preset-env, babel-jest as dev dependencies

Expected Results

Notes

PRs for execa and commander have breaking API changes requiring source modifications—those cannot be fixed through configuration alone.

Issue created from PR #289 during backlog cleanup