`grep -q` exits early on first match, closing stdin to upstream
`$TEST_BIN --list`. With pipefail enabled, that SIGPIPE on the upstream
process bubbles up as exit 141 and kills the workflow before the
sanitizer/nsys can launch.
Capture --list output once into a variable, then grep the captured
string (which doesn't pipe to a process). Same pattern for the
already-broken-but-defensive head -30 in the error branch.
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