`hermes update` and the Desktop update button on an official source
checkout now move between published vX.Y.Z releases instead of tracking
main commit by commit, and `hermes update --set-channel stable` works.
- stable resolves through R2 when a record exists; until one is published
it falls back to the latest published GitHub release (non-draft,
non-prerelease, strict vX.Y.Z, origin tag verified). It used to fail
with "Channel object not found: releases/channels/stable.json".
- default_channel(): an official-origin source checkout defaults to
stable; forks, mirrors and checkout-less trees keep main. Package
installs (MSIX, Store, bundled, electron-updater) are untouched.
- An install that never chose a channel only moves forward: a checkout
already newer than the latest release (every install that tracked main)
stays put until a newer release ships. --set-channel stable is the
explicit consent to land exactly on the release commit.
- Same rule in --check, the apply path and the passive source_check the
Desktop and banner use.
6a92a2aa49