core: reauthentication waits ignore context cancellation #3922

What happened?

When reauthentication is already in progress, another request waits in reauthFuture.Get() without observing its context. A canceled request can therefore remain blocked until the active reauthentication completes.

After successful reauthentication, a failed retry is returned as ErrErrorAfterReauthentication. The error does not unwrap ErrOriginal, so ResponseCodeIs cannot detect status codes such as 404.

Expected behavior: a waiting request returns ctx.Err() when canceled without interrupting the active reauthentication, and the retried request error remains available through standard error unwrapping.

Version

v2 (current)