Pandas Data Manipulation Snippet

Provide a code snippet for data manipulation using Python's Pandas library.

Use the provided orders table as the input data source. Return completed orders for named customers, summarized at the customer level.

Output

1. One row per qualifying customer with customer_name, completed_orders, and total_spent.
2. Include only completed orders and exclude rows without a customer name.
3. Sort by total_spent descending, then customer_name ascending for ties.