flaky test: `TestP2PFull`

CircleCI Insights reports 6 flakes across `go-tests-short`, `go-tests-full`, and `go-tests` in the current 14-day window (checked 2026-08-11).

CI runs:
- https://circleci.com/gh/ethereum-optimism/optimism/5401783
- https://circleci.com/gh/ethereum-optimism/optimism/5440367
- https://circleci.com/gh/ethereum-optimism/optimism/5446081

Representative failures at `host_test.go:260`:

```
failed to dial : no addresses
```

and:

```
failed to dial : all dials failed
* [/ip4/127.0.0.1/tcp/44191] failed to negotiate security protocol:
error reading handshake message: noise: message is too short
```

Each failing attempt took 0.01s and passed on retry in 0.02s.

Start with TestP2PFull and host_test.go:260, then compare the linked CircleCI runs across go-tests-short, go-tests-full, and go-tests. Reproduce the no-address or Noise handshake failures and identify why the peer dial sometimes fails; done means the test no longer flakes across these CI jobs and still verifies the P2P behavior.

Written by the indexing model from the issue text.