Ignacy Łątka cee2433758 test(tool-server): bind the ten remaining test servers to loopback (#1142) ...

Fixes #853

**Cause:** `listen(0)` with no host binds every interface, so ten
ephemeral-port test servers were LAN-reachable for as long as a suite
ran.

**Fix:** pass `"127.0.0.1"` at all ten sites, matching the twenty-two
siblings that already do. Adds a guard test that scans `src/` and
`test/` for any `.listen(0)` missing the host, so a new one fails CI.

No sites left behind: `grep -rn "\.listen("` over every package turns up
only these ten, the twenty-two already-loopback sites, the unix-socket
listens in `native-devtools.ts` / `ax-service.ts` (no host applies), and
`src/index.ts` which already passes `HOST`.

**Docs:** none needed - test-only, no tool, CLI, config key, flow file,
or user-facing capability changes.

<details>
<summary>Verification</summary>

Guard test discriminates - with the ten fixes stashed it names every one
of them:

```
+ [
+   "test/http-upload.test.ts:167",
+   "test/debugger/debugger-status-not-connected.test.ts:76",
+   "test/debugger/log-registry-not-connected.test.ts:73",
+   "test/debugger/metro-cdp-harness.ts:90",
+   "test/metro/integration.test.ts:154",
+   "test/metro/legacy-runtime-guards.test.ts:68",
+   "test/metro/multi-device.test.ts:90",
+   "test/metro/teardown-log-history.test.ts:80",
+   "test/metro/vega-target-routing.test.ts:98",
+   "test/network/network-integration.test.ts:327",
+ ]
```

`http-upload.test.ts` needed two extra lines: `listen(port)` binds
synchronously, but `listen(port, host)` defers behind a DNS lookup, so
`server.address()` came back `null`. It now awaits `listening`. The
client `http.request` had no `host` (defaulting to `localhost`), and its
`error` handler is a no-op, so a failed dial would have made the
assertion pass vacuously - pinned to `127.0.0.1`. Probed that the
request still reaches the server and a partial file is really created
before cleanup:

```
PARTIALS ["argent-upload-d567a1aa-75a0-44e3-9e06-6d42544be1ee.tar.gz"]
ERR Error: socket hang up
```

Ran from the worktree root:

- `npx tsc --build` - clean
- `npm run typecheck:tests -w @argent/tool-server` - clean
- `npm test -w @argent/tool-server` - 369 files, 4833 passed, 1 skipped
- `npm run knip` - clean
- `npx prettier --write` on the changed files - no diff

</details>

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: Claude Opus 5 <noreply@anthropic.com>

2026-09-09 21:26:51 +02:00

..

network-inspector-blueprint.test.ts

Require device_id for debugger/profiler; React profiler session metadata; skill updates (#117)

2026-04-15 10:32:58 +02:00

network-integration.test.ts

test(tool-server): bind the ten remaining test servers to loopback (#1142)

2026-09-09 21:26:51 +02:00

network-interceptor.test.ts

fix(network): report UTF-8 response byte size (#783)

2026-09-02 10:32:58 +02:00