feat(client-archive): async Documenso voids + next-in-line sales notifications

Post-archive side-effects now run with backpressure:
- Documenso envelope voids enqueue to BullMQ documents queue with retry/DLQ
- Released berths fan out a "next in line" notification to port users with
  interests.change_stage; informational only, no auto stage transitions

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/lib/queue/workers/documents.ts

@@ -15,6 +15,26 @@ export const documentsWorker = new Worker(
         await processDocumensoPoll();
         break;
       }
+      case 'documenso-void': {
+        // Async cleanup of a Documenso envelope. Producers: smart-archive
+        // (when the operator opts to void in-flight envelopes during
+        // client archive). BullMQ retries with exponential backoff per
+        // QUEUE_CONFIGS; permanently-failed jobs land in the DLQ via
+        // the failed-job listener.
+        const { documentId, documensoId, portId } = job.data as {
+          documentId: string;
+          documensoId: string;
+          portId: string;
+        };
+        if (!documensoId) {
+          logger.warn({ documentId }, 'documenso-void: no documensoId, skipping');
+          return;
+        }
+        const { voidDocument } = await import('@/lib/services/documenso-client');
+        await voidDocument(documensoId, portId);
+        logger.info({ documentId, documensoId, portId }, 'Documenso envelope voided');
+        break;
+      }
       default:
         logger.warn({ jobName: job.name }, 'Unknown documents job');
     }