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

bin/quak.ts

@@ -23,6 +23,7 @@ import { run as runCommand } from "../src/cli-run.js";
 import { loadSession } from "../src/cli-session.js";
 import { Client } from "../src/client.js";
 import { VERSION } from "../src/index.js";
+import { UNATTENDED_RETRY_OPTIONS } from "../src/retry.js";
 
 const paths = envPaths("quak", { suffix: "" });
 
@@ -129,8 +130,20 @@ program
     )
     .argument("<dir>", "Output directory")
     .option("--json", "Print result as JSON instead of human-readable summary")
+    // A backup usually runs from cron with nobody watching, so every request
+    // it makes retries for longer than the other commands' requests do.
     .action((dir: string, opts: { json?: boolean }) =>
-        run(backupCommand(context(), dir, opts)),
+        run(
+            backupCommand(
+                {
+                    ...context(),
+                    loadSession: (path) =>
+                        loadSession(path, { retry: UNATTENDED_RETRY_OPTIONS }),
+                },
+                dir,
+                opts,
+            ),
+        ),
     );
 
 const helper = program