quak backup retries failed requests for longer (closes #165)

src/retry.ts exports UNATTENDED_RETRY_OPTIONS beside the unchanged
default: 10 attempts, a 1 s base delay and a 60 s cap, so a request that
keeps failing waits at most 243 s before it gives up. bin/quak.ts loads
the backup's session with them, so its refresh, ML data and downloads
all use them; every other command keeps the default. What is retried
and the backoff formula are unchanged.

Model: opus-5-5

test/client/session.test.ts

@@ -12,6 +12,10 @@ import { afterAll, beforeAll, describe, expect, it } from "vitest";
 import { init, toBase64 } from "../../src/crypto/index.js";
 import { Client, type ClientSnapshot } from "../../src/client.js";
 import { loadSession } from "../../src/cli-session.js";
+import {
+    DEFAULT_RETRY_OPTIONS,
+    UNATTENDED_RETRY_OPTIONS,
+} from "../../src/retry.js";
 
 const validSnapshot = (): ClientSnapshot => {
     const kp = sodium.crypto_box_keypair();
@@ -176,6 +180,20 @@ describe("loadSession", () => {
         });
     });
 
+    it("gives the restored client the retry options it is passed", () => {
+        const path = join(dir, "retry.json");
+        writeFileSync(path, JSON.stringify(validSnapshot()));
+        const retryOptions = (client: Client | null) =>
+            client!.getApiClient().getRetryOptions();
+
+        expect(
+            retryOptions(
+                loadSession(path, { retry: UNATTENDED_RETRY_OPTIONS }),
+            ),
+        ).toEqual(UNATTENDED_RETRY_OPTIONS);
+        expect(retryOptions(loadSession(path))).toEqual(DEFAULT_RETRY_OPTIONS);
+    });
+
     it("says the file is corrupt when it is not JSON", () => {
         const path = join(dir, "truncated.json");
         writeFileSync(path, '{"email": "user@exa');