fix: drop exports and commitlint in built package file

[byCedric]

This changes:

1. The Node module resolution breaking exports from the built package.json file.
2. It also removes the commitlint property, as that's project-related config that doesn't need to be published.
3. And it's simplifying the tsup execution path, all node module binaries are available by their name in npm scripts (for any package manager)