Fabro Workflow Factory

This is proper workflow orchestration for AI agents, not another chatbot wrapper. You define pipelines as Graphviz DOT files with support for human approval gates, multi-model routing via CSS-like stylesheets, parallel execution, and automatic retry loops. The human gate pattern is especially clever: workflows pause at hexagon nodes until you run `fabro approve` or `fabro reject`, so agents handle the grunt work while you control the decision points. Model routing lets you assign Opus to planning nodes, Sonnet to implementation, and GPT-4o to review using class selectors. It's written in Rust, runs as a persistent service, and includes sandbox SSH access and cost retrospectives. If you're coordinating multi-step agent workflows rather than one-off prompts, this gives you the control plane you actually need.