sdtm-check — deterministic CDISC SDTM delivery-conformance checks

The check scripts, CLI and tests in this distribution are original work.

They are packaged to run as `script` executor steps inside Mediforce
(https://github.com/Appsilon/mediforce), an open-source workflow platform by
Appsilon Sp. z o.o. licensed under the Apache License, Version 2.0. Mediforce
is not included in this distribution and is not modified by it; the bundled
workflow definition (clincoder-ct-check.wd.json) simply targets its schema.

Controlled terminology is supplied at runtime by the `p21bridge` R package,
which is not included here.
