'latest' held only manifest.json, which serves the launcher but not a person:
it sits at the top of the Releases page with nothing to click, so a friend has
to know to scroll past it to a build tagged with a timestamp. That is the exact
friction this feed exists to remove.
It now carries the client and launcher zips as well, and its body says plainly
which file to download and what to do with it. Storage cost is flat, not per
build: 'latest' is deleted and recreated each publish, so it is one extra copy
at any time rather than one per release.
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