Workflows: Open-source Rust engine for agentic automation with human-in-the-loop

Workflows is a Rust library that models automation as a typed directed graph, validated and compiled before execution. It supports LLM agents, HTTP requests, code execution, and conditional branching with deterministic parallel fan-out. The engine is host-agnostic via traits for LLM, tools, HTTP, code, and state, and includes built-in human-in-the-loop approval pauses.