o Major bugfixes (security):
    - Correctly copy the MiddleOnly flag from routerstatuses
      to node objects.  Without this fix,
      the MiddleOnly flag was ignored on non-authorities,
      and clients could use MiddleOnly relays
      for inappropriate roles in onion service circuits.
      Fixes bug 41410; bugfix on 0.4.8.15.
      Tracked as TROVE-2026-067.