strict tsc. The five `s.track("name", { props })` calls used the
web/RN positional-args shape; Node SDK's track takes a single
`ServerEvent` object. Switched to `s.track({ name, properties })`.
Plus a non-null assertion on `sent[0].length` for
`noUncheckedIndexedAccess`. v1.4.1 was tagged on the public
crossdeck-node repo but its publish workflow aborted on these
errors. v1.4.2 is the first 1.4.x line to land on the npm
registry. **No SDK code changes vs v1.4.0 / v1.4.1**.