Three follow-ups from Task 9 code review:
1. Cross-port isolation test now explicitly asserts the other-port
file's id is absent from the aggregated result (previously only
checked .length > 0, which would pass even with leakage).
2. Refine errors now carry path fields so frontend field-level error
display can target the right form input (matches createDocumentSchema
pattern in the same validators module).
3. Add a service-composition test for the signing-details route's
workflow+signers+events shape — closes the coverage gap for the
thin Promise.all combinator.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Matt
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