feat(intake): run the drafting worker after a submission and on a sweep (#223)

Two drivers. The call after a successful submission means a draft is usually waiting by the time anybody looks; the five-minute sweep means a restart mid-draft is recoverable rather than a permanently stalled row, and picks up whatever the first call missed.

Neither is awaited. A slow or failing model must not become a failed upload for someone who did nothing wrong, which is the whole reason drafting does not happen inline — the cost of a dropped call is a few minutes' delay, not a lost submission.

Both catch for themselves. The comment beside the existing schedulers points out that `void` is only safe because those functions handle their own errors, and draftQueued does not: its first query can reject, and an escaping rejection would take the container down.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

backend/src/server.ts

@@ -6,6 +6,7 @@ import { renderTemplate, greeting, formatDuration } from './emailTemplates';
 import { getSettings } from './adminSettings';
 import { loadStoredTemplate } from './routes/adminEmailTemplates';
 import { validateEnv } from './envValidation';
+import { draftQueued } from './intake/draftingWorker';
 
 // Release cart holds whose expiry has passed.
 async function sweepExpiredCarts(): Promise<void> {
@@ -96,6 +97,16 @@ interface ReminderRow {
 setInterval(() => void sweepExpiredCarts(), 5 * 60 * 1000);
 cron.schedule('0 9 * * *', () => void sendCartReminders());
 
+// Every five minutes, in the same shape as the cart sweep. This is what makes a
+// restart mid-draft recoverable rather than a permanently stalled row, and what
+// picks up anything the post-submission call missed. Unlike the two above,
+// draftQueued does not catch at its own top level — the initial query can
+// reject — so it catches here instead, for the reason the comment above gives.
+setInterval(
+  () => void draftQueued().catch((err) => console.error('[drafting] sweep:', err)),
+  5 * 60 * 1000
+);
+
 const PORT = parseInt(process.env.PORT || '3000', 10);
 
 // Checked at boot rather than left to be discovered by the first request that