Client codegen chained .then().catch(), so a .catch() after .then()
caught exceptions thrown by the response body too. Switched to the
two-argument then(onFulfilled, onRejected) form, whose rejection
handler cannot see errors from the fulfilment handler.
SSR codegen wrapped both the transport call and the response-body eval
in the same try; only __wrnexusCallApi is now inside the try, and
__wrnexusEvalData runs after it, outside.
Also verifies (and locks in with a regression test) that GET query
numbers already coerce correctly through defineEndpoint + checkField,
and documents that in the typed-api-block spec.
Clintchiz
