.nrepl-port sometimes not honored

Hi @bhauman !

I'm using a vanilla installation following the provided instructions faitfhully, over Claude Code.

I found that sometimes `--discover-ports`, as invoked by CC, sometimes finds nothing, despite .nrepl-port existing and referring to an active port.

Perhaps the cwd may be incorrectly set at times?

This is how it can look in CC:

```
⏺ Bash(clj-nrepl-eval --discover-ports)
⎿  No nREPL servers found.
```

What about this change?

```diff
-No nREPL servers found.
+No nREPL servers found. Are you running this command in the right cwd?
```

The extended message may nudge the models into doing the right thing - else, they can skip instructions in Skills/etc.

Thanks - V

Start with the `clj-nrepl-eval --discover-ports` entry point and locate where the `No nREPL servers found.` output is produced. Update the message to mention checking the current working directory, then run the discovery command in a case with no discovered servers to verify the wording.

Written by the indexing model from the issue text.