Telegram: harden network retries and config

Co-authored-by: techboss <techboss@users.noreply.github.com>

src/infra/retry-policy.test.ts

@@ -0,0 +1,27 @@
+import { afterEach, describe, expect, it, vi } from "vitest";
+
+import { createTelegramRetryRunner } from "./retry-policy.js";
+
+describe("createTelegramRetryRunner", () => {
+  afterEach(() => {
+    vi.useRealTimers();
+  });
+
+  it("retries when custom shouldRetry matches non-telegram error", async () => {
+    vi.useFakeTimers();
+    const runner = createTelegramRetryRunner({
+      retry: { attempts: 2, minDelayMs: 0, maxDelayMs: 0, jitter: 0 },
+      shouldRetry: (err) => err instanceof Error && err.message === "boom",
+    });
+    const fn = vi
+      .fn<[], Promise<string>>()
+      .mockRejectedValueOnce(new Error("boom"))
+      .mockResolvedValue("ok");
+
+    const promise = runner(fn, "request");
+    await vi.runAllTimersAsync();
+
+    await expect(promise).resolves.toBe("ok");
+    expect(fn).toHaveBeenCalledTimes(2);
+  });
+});