Promotion Post-Evaluation Agent

Promotions should add sales and profit, not just move them from other weeks or products. After each promotion ends, this agent pulls sales and the promotion's terms, then builds a baseline of what would have sold without it. It checks that the baseline is clean. If last year's comparison period had a different event, such as a holiday, it adjusts the baseline and checks again. It measures cannibalization of other products and stock-up effects in the four weeks after, when customers may buy less. It then calculates incremental margin after supplier funding. Based on the result, it drafts a verdict to repeat, change or stop the promotion; negative incremental profit means stop. The category manager approves the verdict, which goes into the promotion log. Edge case: when a supplier funded the promotion, the agent includes that funding before judging profit.