Adds the decision half of the app updater. Detection (P2) and the
snapshot-first apply/revert (P3) were already real, but nothing ever
pressed the button — every update waited for a click.
CFG_<APP>_UPDATE_TYPE=auto|manual per app, default auto (33 templates)
CFG_UPDATER_AUTO=true|false master switch, default true
updaterAppPolicy resolves the two the way backupResolveStrategy already
resolves backup strategy: the global switch can only make things more
manual. updaterApplyAuto runs at the end of `updater check` and enqueues
the ordinary updater_apply task for each auto app that has an update —
never applies inline, so an automatic update is the same code path, task
log, History entry and Roll back button as a manual one.
Safety: each attempt stamps its target digest under generated/auto/, so a
build that fails is rolled back and then left alone rather than retried on
every scan; in-flight updater tasks are skipped so scans can't stack.
Tracked end to end: updates.json carries each app's resolved update_type,
History entries carry trigger=manual|auto. The WebUI says whether updates
install themselves, chips only the apps that opted out, labels automatic
history, and — since an auto app's pending update needs no decision — keeps
it off the Overview board's "Needs action" view.
Also fixes artifactApplyAuto enqueueing without --detach: it runs inside
the single-threaded task processor's own poll, so following the new task in
the foreground waits for a task that cannot start until it returns.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
cdeb2d1658