Upload feature (e): wire inline upload (registratie beroep) + documenten step (herregistratie)

- Fold UploadState into both wizard machines; route via { tag: 'Upload', msg }
- Gate step validation on requiredCategoriesSatisfied; include deliveryRefs in submit
- Shared createUploadController (effectful glue: categories, transport, focus-poll, File map)
- rejectReason pure format validator + specs; bump registratie storage key to v2

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/app/registratie/application/submit-registratie.ts

@@ -11,7 +11,7 @@ import { runSubmit, SUBMIT_FAILED } from '@shared/application/submit';
  */
 export function submitRegistratie(client: ApiClient, data: ValidRegistratie): Promise<Result<string, string>> {
   return runSubmit(async () => {
-    const res = await client.registrations({ diplomaHerkomst: data.diplomaHerkomst });
+    const res = await client.registrations({ diplomaHerkomst: data.diplomaHerkomst, documents: data.documents });
     return res.referentie ?? '';
   }, SUBMIT_FAILED);
 }