79c758c046268a4a56b2ab6ee50c34b0037c3552
Closes the coverage gap that hid task #22's pointer-rooted N_DOT bug: test/wcc/900_stdlib.c claimed "Coverage lives at lib/bufio/bufiotest.ww" but no test/wcc/*.c ran bufiotest. New 998_bufio_run runs it and propagates exit; matches 910_at_test pattern.
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