We need to produce a 2-3 sentence plain-text summary, objective, factual, no marketing, no superlatives, no calls to action. At most 60 words. Summarize skill: tests pluck primitive (SELECT single field). It creates test data internally, creates $papers collection (4 papers with id, title, year, citations, venue), plucks title field, expects $titles collection with 4 items each containing just title string. Problem it solves: verifies that pluck operation works correctly, ensures ability to extract single field from collection.