automatic Apply forward to leader?

It's not possible to call Raft.Apply on any node that isn't the leader.
This forces implementations to forward the message to the
leader if a non-leader wants to apply a log message.

Given that the Raft already has connectivity to the peers,
why not make this automatic, so Apply could be run on non-leaders
too?

Start by reading the Raft.Apply entry point and the issue discussion to understand the current leader-only behavior and the proposed forwarding semantics. Define what successful forwarding and failure should mean for callers, then verify the behavior across leader and non-leader nodes.

Written by the indexing model from the issue text.