hethon/ingen ? reverse-engineered prompt

Build me a small command line tool that helps me generate install scripts for my app releases.

I want to give it a simple JSON manifest with my app name, version, download links, and checksums, then have it create both a shell installer and a PowerShell installer that people can run with curl or irm. It should also be able to create a starter manifest for me, and if my releases are on GitHub it should be able to pull in the checksums from the release assets and update the manifest automatically.

The generated installers should support the usual things people expect, like quiet or verbose output, choosing an install folder, not changing PATH if I do not want it to, and using a GitHub token for private releases. Keep it portable and safe, and make sure the output files are ready to upload somewhere over HTTPS. Use the docs and examples in the repo as a guide, and look up current docs online if you need to.