732_def_const_fold.c -> r732_def_xmod_fold (run-exit 42; stronger than
the carrier's DATA-row grep — links AND reads the folded cross-module
value), r732_def_xmod_cycle (error 'def value: reference chain too
deep', upgrading the needle-less exit!=0 check).
The five same-module exec rows and both same-module fail-loud rows were
already owned by the r732_def_* fixtures; their cs-vs-ww byte identity
rides test-data-byteid, which now also covers the xmod fold row. The
timeout-124 hang distinction devolves to the wwfixture harness timeout.
Hojun-Cho
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