58710a0263
Opik requires version 7 UUIDs. wp_generate_uuid4() was producing v4
which the API rejected with 422. Replaced both call sites in
class-opik-trace-context.php with generate_uuid7(), a private static
method implementing RFC 9562 §5.7.
Fixes: smoke test 422 {"errors":["Trace id must be a version 7 UUID"]}