[EPIC] Automation — Phase 3: Loops + Complex Execution

[stelbailey]

Goal

Add loop and parallel execution capabilities to the automation engine.

Scope

Backend

• ForEachNodeExecutor
• WhileLoopNodeExecutor
• ParallelNodeExecutor
• SubWorkflowNodeExecutor

Frontend

• Unlock Phase 3 node types in the palette
• Designer input required for loop/parallel UX (iteration state display, parallel branch visualization)

Dependencies

• Cuts from Phase 2 branch after Phase 2 merges
• Note: Parallel and ForEach behavior may differ depending on the execution backend chosen in Phase 1 (Temporal handles concurrency natively; Quartz ephemeral jobs require a different approach). Revisit before starting.

Notes

• Designer review required before FE implementation