In search of a framework for composable workflows (not for AI or Low-code/no-code)

Looking for a better way to compose applications that are sequences of idempotent/reusable steps.

Something like GitHub Actions but JavaScript/TypeScript-native.

I want something that defines and handles the interface between steps.

cmd-ts had a basic approach to this that I liked but it was pretty basic and didn't have any concept of concurrency, control flow or error handling (because that's not what it's for), but maybe that will help convey what I am looking for.

I'm also aware of trigger.dev and windmill.dev but skeptical about vender buy-in.