Function createProductionWorkflowEngine

Workflows exports - Workflow engine with parallel execution Split from index.ts for file size compliance (Issue #285)

createProductionWorkflowEngine(
config?: WorkflowEngineFactoryConfig,
): Promise<IWorkflowEngine>
Creates and initializes a WorkflowEngine with auto-detected model adapter.

This is the most complete factory function - it:
1. Loads built-in templates
2. Auto-detects the best available model adapter (CLI or API)
3. Creates the workflow engine with real step execution
Falls back gracefully to mock execution if no adapter is available.
Parameters
- Optionalconfig: WorkflowEngineFactoryConfig
  Engine configuration
Returns Promise<IWorkflowEngine>
Promise resolving to WorkflowEngine instance
Example
```
// Create production-ready workflow engine
const engine = await createProductionWorkflowEngine();

// Execute a workflow with real agent experts
const result = await engine.execute(workflow, inputs);
```
- Defined in packages/nexus-agents/src/workflows/workflow-engine-factory.ts:687