This PR removes always included files and folders from the
[`package.json#files`
field](https://docs.npmjs.com/cli/v11/configuring-npm/package-json#files):
> Certain files are always included, regardless of settings:
> - package.json
> - README
> - LICENSE / LICENCE
> - The file in the "main" field
> - The file(s) in the "bin" field
Validated by running `pnpm i && cd codex-cli && pnpm build && pnpm
release:readme && pnpm pack` and confirming both the `README.md` file
and `bin` directory are still included in the tarball:
<img width="227" alt="image"
src="https://github.com/user-attachments/assets/ecd90a07-73c7-4940-8c83-cb1d51dfcf96"
/>
ee3a9bc14b