TCP Connection returns EOF for queries after ping

Nobody has claimed this yet.

When using the `Ping()`queries don't work anymore and return `EOF` from the TCP stream. The obvious workaround is to reconnect after ping (or don't ping). But this should be fixed.

Minimal example to reproduce:

```
clTemp := manticore.NewClient()
clTemp.SetServer("localhost", 9312)
clTemp.Open()
clTemp.Ping(123) // if I remove this line the query returns results
res, err := clTemp.Query("foo", "temprt")
if err != nil {
fmt.Printf("Error test querying Manticore %+v", err) // EOF
}
```

Start by running the minimal Go example against Manticore Search on localhost:9312 and compare Query behavior with and without Ping(123). Trace the client’s Ping, Query, and TCP stream handling to identify why the post-ping query returns EOF; done means queries succeed after Ping without reconnecting.

Written by the indexing model from the issue text.