Legacy code often cannot build locally by nature — CICS/IMS programs
have no local translator and the real runtime may be a mainframe the
user doesn't have. Stopping transform on a failed legacy smoke compile
would block exactly those systems.
- transform Step 0a: the target toolchain remains required (its tests
cannot run without it); a failed or impossible legacy compile no
longer stops the run — the equivalence strategy switches to recorded
traces / golden-master fixtures, and that downgrade is stated in the
plan and in TRANSFORMATION_NOTES.md so reviewers know the strength of
the proof
- preflight: a red legacy toolchain now yields Ready-with-gaps for
transform/reimagine instead of Not-ready
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