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569de4cd23
The `held` channel in `runTwoRequests` was unbuffered, creating a race condition with the `select/default` send in the handler. Under CI load (slow runner, -race, -shuffle=on), the handler goroutine could reach the select before the test goroutine blocked on `<-held`, causing the send to silently fall through to `default` and deadlocking both goroutines permanently. Buffer the channel (capacity 1) so the send always succeeds regardless of goroutine scheduling order.