The decorator records the @trek/shared response schema a route answers
with. Under NODE_ENV=test it adds an interceptor that parses every response
and fails the request with a logged 500 naming the handler and the issues,
so the e2e and integration suites catch a response that drifted from its
contract; in production nothing is added to the request path and the body
is never rewritten. lint:response-contracts holds the handlers still without
one to a per-file baseline that only shrinks, and runs in server-quality.
Maurice