Batch Annotate Items

Create annotations for multiple queue items in a single batch request. This is useful for bulk annotation workflows where you need to annotate many items with similar feedback. **Important:** - All queue item IDs must exist and belong to the specified queue - For thread items: Use `expectedOutcome` (not `expectedOutput`) - For trace/span items: Use `expectedOutput` (not `expectedOutcome`) - Set `markAsCompleted: true` to automatically mark all annotated items as completed (default: true) - Returns the IDs of all created annotations