The manager takes a staged file as a release: sourceId local-file and
the file ID as the version. It runs through the one lifecycle path, so
generations, backup, recovery and the host access approval apply as for
a library package. The approval digest is the sha256 of the zip.
The same version is refused, and an older one needs a confirmed
downgrade. Files wait in a private per-user staging area for an hour.
An add-on from a file has no library, so no update check answers for it.
Assisted-by: Claude:claude-sonnet-5-5 go gofmt
Ettore Di Giacinto
c604f3a133