RoutinesPane resolved its cron owner from a bare $lastRoster.get()
snapshot. BotsHomeView owns the roster fetch, so whenever the pane
mounted before that fetch landed (fresh boot ordering, renderer reload
resetting the atoms) it captured an empty roster forever: the pane
stayed pinned on "Cronjobs are unavailable until this agent appears in
the roster." and Create Cronjob silently no-oped until some unrelated
atom happened to re-render it (#94483).
Subscribe via useValue($lastRoster) instead, matching every other
consumer of the shared roster. Scoping intent is unchanged: a complete
focused owner without an exact roster row still fails closed rather
than routing cron reads/mutations through a stale selection or an
unscoped profile name (contracts in routines-selected-bot.test.mjs).
The source contract in focused-bot-highlight.test.mjs pinned the bare
.get() shape; it now pins the subscription form while keeping the
socket-home-atom prohibition that motivated it.
Fixes#94483