A stable studio-vX.Y.Z that is the highest stable studio tag is created with
--latest and without --prerelease. Candidates (-preview.N, -rc.N) keep
--prerelease --latest=false, and recovering an older stable tag does not take
latest back. The decision lives in scripts/studio-release-flags.sh and reads
the tag grammar, not wording.
The GitHub release no longer carries a root latest.json. The 1.x desktop
updaters fall back to releases/latest/download/latest.json, and builds up to
1.18 do not validate the manifest and share Studio's minisign key, so a
Studio manifest there would offer them a Studio package. The file stays in
the R2 mirror under <tag>/, which is the only place Studio reads it. The
release now has 21 assets.
Adds a flags-script test and a workflow contract test, and updates the
runbook, READMEs, MIGRATING and ROADMAP.
yhh
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