ctxscope v1.0.1 — doc correction: plain slog calls keep the global tier A plain slog.Info loses the per-context tier but keeps the global one, which never came from a context. The docs said it carried no scope at all. No behaviour change. Adds the two tests that would have caught it, including the first coverage of the slog.SetDefault + package-level slog.InfoContext setup the README recommends.