fix(telegram): add dnsResultOrder=ipv4first default on Node 22+ to fix fetch failures (#5405)

Merged via /review-pr -> /prepare-pr -> /merge-pr.

Prepared head SHA: 71366e9532
Co-authored-by: Glucksberg <80581902+Glucksberg@users.noreply.github.com>
Co-authored-by: obviyus <22031114+obviyus@users.noreply.github.com>
Reviewed-by: @obviyus

src/telegram/network-config.test.ts

@@ -2,6 +2,7 @@ import { afterEach, describe, expect, it, vi } from "vitest";
 import {
   resetTelegramNetworkConfigStateForTests,
   resolveTelegramAutoSelectFamilyDecision,
+  resolveTelegramDnsResultOrderDecision,
 } from "./network-config.js";
 
 // Mock isWSL2Sync at the top level
@@ -129,3 +130,34 @@ describe("resolveTelegramAutoSelectFamilyDecision", () => {
     });
   });
 });
+
+describe("resolveTelegramDnsResultOrderDecision", () => {
+  it("uses env override when provided", () => {
+    const decision = resolveTelegramDnsResultOrderDecision({
+      env: { OPENCLAW_TELEGRAM_DNS_RESULT_ORDER: "verbatim" },
+      nodeMajor: 22,
+    });
+    expect(decision).toEqual({
+      value: "verbatim",
+      source: "env:OPENCLAW_TELEGRAM_DNS_RESULT_ORDER",
+    });
+  });
+
+  it("uses config override when provided", () => {
+    const decision = resolveTelegramDnsResultOrderDecision({
+      network: { dnsResultOrder: "ipv4first" },
+      nodeMajor: 20,
+    });
+    expect(decision).toEqual({ value: "ipv4first", source: "config" });
+  });
+
+  it("defaults to ipv4first on Node 22", () => {
+    const decision = resolveTelegramDnsResultOrderDecision({ nodeMajor: 22 });
+    expect(decision).toEqual({ value: "ipv4first", source: "default-node22" });
+  });
+
+  it("returns null when no dns decision applies", () => {
+    const decision = resolveTelegramDnsResultOrderDecision({ nodeMajor: 20 });
+    expect(decision).toEqual({ value: null });
+  });
+});