Olm still reports relay after packets start going directly to Newt

## Describe the Bug

I have two Newt sites on the same private network as my Mac. They use host networking and fixed UDP ports. The Mac is on a separate routed subnet and can reach both Newt addresses directly.

After fully restarting the Pangolin macOS client, both sites showed:

```json
{
"endpoint": "pangolin.example.com",
"isRelay": true,
"isLocal": false
}
```

About a minute later, `tcpdump` showed the Pangolin PacketTunnel process sending and receiving packets directly with one of the Newt LAN addresses:

```text
192.168.10.11.55000 > 192.168.30.16.52143: UDP, length 128
192.168.30.16.52143 > 192.168.10.11.55000: UDP, length 96
```

`lsof` confirmed that source port 55000 belonged to the PacketTunnel process. The 25-byte local test request and reply also succeeded for both Newt addresses.

The status still showed `isRelay: true` and `isLocal: false`. `lastSeen` stopped updating for those sites at the time they changed to relay, while other peers continued updating.

I found [#72](https://github.com/fosrl/olm/issues/72), but I do not have an overlapping private-resource route for either Newt address.

Am I misunderstanding what `isRelay` and `isLocal` are intended to report, or should they change when the UDP socket starts using the local Newt address?

## Environment

- OS Type & Version: macOS 26.6, build 25G72
- Pangolin Version: 1.22.0
- Edition: Enterprise
- Gerbil Version: 1.5.0
- Traefik Version: 3.7
- Newt Version: 1.16.0
- Client Version: Pangolin macOS 0.11.0

## To Reproduce

1. Run a Newt site with host networking and a fixed UDP port.
2. Make the Newt LAN address reachable from the client.
3. Fully restart the Pangolin macOS client.
4. Check `/status` through `/var/run/olm.sock`.
5. Capture packets between the client and Newt LAN addresses.

## Expected Behavior

I expected the status to show the local Newt address with `isLocal: true` once packets started going directly to it. If these fields describe something other than the address actually in use, clarification would be helpful.