serf: stay in an inner road between events #540
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This PR runs the serf in an inner road, as long as possible. In practice, the serf will return to the home road to take a snapshot or for
|pack,|meld, and|mass.With this change, all allocations of events and effects no longer modify persistent state. Home-road unification (which we don't have) is somewhat deprioritized, as arvo lives on an inner road between snapshots. On the other hand, with the more efficient free-list utilization from #539, the many small (re)allocations involved in incremental arvo updates should help to defragment the home-road heap.
This PR is a draft because the changes are still somewhat messy, and the error-handling behavior after this change needs to be carefully tested.
This PR should help with urbit/urbit#6805