This question evaluates a data scientist's competency in recommender systems, product analytics, A/B experimentation, causal inference, feature engineering, and handling business constraints such as cold-start and attribution.

You are working on a food-delivery app with a personalized home page. The team wants to add a new module called "Restaurants You May Know" to help users discover relevant restaurants they haven’t ordered from recently.
Assume standard clickstream and order events are available (impressions, clicks, add-to-cart, orders, order value), and the module links to the restaurant’s menu page.
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