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Introduce _RpcClientError and _RpcInternalError as distinct subclasses of _RpcError so the dispatcher can handle bad requests and server-side faults differently — returning client errors verbatim and logging internal faults with their cause before replying ERR_INTERNAL. Wrap write_proposal and archive_proposal IO with _RpcInternalError so OS failures surface through the typed path instead of the bare Exception fallback. All existing raise _RpcError(...) call sites converted to _RpcClientError. Closes #253