…that redis creates internally during cluster handshake (during initial cluster MEET, cluster MEET, cluster PONG sequence) since they are not expected to be usable members of the cluster at that time.

approved these changes Mar 24, 2026

…external callers can still fetch the value

- add new IgnoreFromClient internal member for ^^^, and use
- support "handshake" etc in the in-proc test server
- support "only initially connect to default node" in the in-proc test server
- add a unit test that handshake nodes are ignored