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The store package has no test files of its own (its API is exercised end-to-end through the server's eachStore harness against both Memory and Postgres). Without -coverpkg, store/* shows 0% and drags the total below the 70% gate even though every store method is run. -coverpkg=./internal/... routes the instrumentation from server tests into store + config + server alike. Refs: M4.2