xnurta-product-diagnosis

Diagnose product-level (ASIN) health: rank products by spend/sales/ACOS, segment the catalog into a lifecycle tier (star / core / long-tail / new / declining), compare sibling variants under a parent ASIN, produce a diagnostic card for flagged underperformers (inventory/eligibility/buy-box issues, correlated operation-log changes), and give keep/optimize/cut recommendations. Use when the user asks "我哪些 ASIN 有问题",…