The signed-amount example in 0fe616e was misread in the focused rerun as 'a
signed amount breaks only the digits-only rule', and the run again missed
the seeded non-digit defect. The stop rule now states the principle: each
field's documented input rule needs a probe that breaks only it and satisfies
every other rule.
Co-authored-by: capy-ai[bot] <230910855+capy-ai[bot]@users.noreply.github.com>