Orchestrating Workflow with Ludwig and Human-in-the-Loop

Extend the agent's capabilities to orchestrate a content approval workflow using Ludwig. When a content piece fails initial review, the agent should be able to trigger a Ludwig workflow that involves a human expert for manual review and approval. Create a tool `trigger_ludwig_workflow(content_id: str, issues: list[str]) -> str`. Describe how this tool would interface with a Ludwig endpoint and how the agent would decide to use it. Provide the Python code for this new tool.