We rebuilt the flow engine from scratch, and it shows ⚙️ The new modular architecture gives each card type its own handler, supports sub-flows that automatically resume the parent when done, and guarantees zero duplicate card execution. No more "why did the customer get two identical messages?" moments. Redis-based timeout management replaces polling, and a comprehensive variable system with 8 namespaces makes complex flows predictable and actually debuggable. A 100-iteration safety limit prevents infinite loops so a misconfigured flow can't run away on you. Sub-flows resume the parent on completion, timeout, or error. The execution status lifecycle tracks everything through Running, Waiting, Completed, Timeout, and Error states. System variables like current date, time, timezone, and user data populate automatically. It's the invisible engine that makes everything else reliable 💪
