ata-validator

Fixed

• The native engine stops printing to stderr for patterns outside RE2's subset. A pattern with lookahead or a backreference is an expected input, not a fault: construction is probed, and the JavaScript engines answer for the pattern instead. RE2 logged every such probe to stderr anyway, so a schema carrying zod's email pattern printed two C++ error lines on compile while validating correctly. RE2 is now constructed with logging off; verdicts are unchanged.