43 tests exercising one happy path and the major error paths per
module (invalid regex pattern, oversize random::bytes, malformed JSON,
bad base64, mixed-case hex round-trip, invalid UTF-8 in url::decode,
etc.). Harness duplicates the pattern from sdk_contract.rs — each
integration test file in this crate keeps its own; there is no
tests/common/.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
