test_shell_lone_copy_reds_on_its_sibling asserted the fixture path it had just
built while verify_hermes_setup.sh reports the path it resolved with readlink -f.
Under TMPDIR=/root/.hermes/profiles/volt/cache/scratch_link a correct pair read
MISSING and the gate went rc 1 (measured before the repair: that cell was the
only red, 15 others ok). The fixture root is now canonicalised once in setUp
with os.path.realpath; two new cells pin the alias reading instead of assuming
it -- a lone copy reached by a directory symlink names the real sibling that is
absent (rc 1), and the same alias with the sibling present reads PASS (rc 0).
CHECK-env-verifiers now runs the suite twice, ambient TMPDIR and a directory
alias it builds, so the shape that produced the flake is graded every run.
16 cells; negative control (raw mkdtemp restored in a scratch copy) reds the
alias leg and only that leg, rc 1.
volt
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