fix: simplify max-turns error message by removing contradictory example

pkg/workflow/agent_validation.go

@@ -113,7 +113,7 @@ func (c *Compiler) validateMaxTurnsSupport(frontmatter map[string]any, engine Co
 
 	// max-turns is specified, check if the engine supports it
 	if !engine.SupportsMaxTurns() {
-		return fmt.Errorf("max-turns not supported: engine '%s' does not support the max-turns feature. Use engine: copilot or remove max-turns from your configuration. Example:\nengine:\n  id: copilot\n  max-turns: 5", engine.GetID())
+		return fmt.Errorf("max-turns not supported: engine '%s' does not support the max-turns feature", engine.GetID())
 	}
 
 	// Engine supports max-turns - additional validation could be added here if needed

smoke-test-22331673771.json

@@ -0,0 +1 @@
+{ "smoke_test": "run-22331673771", "status": "pass" }