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socks users: detect closed sockets. (TROVE-2024-011)

Nick Mathewson requested to merge nickm/arti:socks_read_zero into main

Without this check, our socks code can enter an infinite loop if a socket is closed at the wrong time.

Resolves TROVE-2024-011.

Fixes #1635 (closed).

Additionally, this branch fixes a less severe bug in the use of copy_within, spotted by @opara.

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