Evaluate a running AI workflow for quality and fit. Use when the user wants to review how a deployed workflow is performing, check if it needs tuning, or decide whether it should go back to Design (including graduating from a skill to an agent). Also use when the user says "continue my workflow" and the Workflow node's artifacts show Step 7 (Improve) is next, or its `stale_after` date has arrived. This is Step 7 (Improve) of the AI Workflow Framework.
