Cold-review follow-ups on the PR:
- Trim the oversized docblocks/inline comments added across the API controller,
MediaAttacher, Post, the publish job, and the X publisher to one line (keeping
the @param/@return array-shape annotations).
- XPublisher::chunkedUpload now accepts ?string $mediaCategory and only sends
media_category when present — getMediaCategory() can return null, so the strict
string param was a latent TypeError (unreachable on X today, removed anyway).
- Fix MediaAttacher docblocks: the file imports Type as MediaType, so the
@param array<Type> annotations didn't resolve — now array<MediaType>.
- Tests: cover the failed() job hook genericizing a raw error, and X failing
cleanly (XPublishException) when media can't be downloaded.