refactor: delete shadow contracts DTOs, parse the generated shape for real (Step 2/8)

dashboard-view.dto.ts and brp-address.dto.ts each shadowed a generated
type: DashboardViewDto was declared twice (hand-written with required
fields, generated with everything optional), reconciled only by
structural typing. Both are gone.

dashboard-view.adapter.ts now imports the generated DashboardViewDto/
RegistrationDto/PersonDto/RegistrationStatusDto directly. Its parse
does real work now instead of an identity copy: parseRegistrationStatus
validates each status variant's required fields per-tag (the generated
type flattens the union, so a Geregistreerd row missing
herregistratieDatum previously passed the boundary unnoticed — it no
longer does). HerregistratieDecisions moves from contracts/ to
domain/registration.ts, so no contracts-typed value reaches a page.

brp.adapter.ts drops its own BrpAddressDto shadow the same way.

Hand-written contracts/*.dto.ts count: 4 -> 2 (duo-diplomas.dto.ts and
stamdata.dto.ts remain — both parse fields codegen can't type at all).

Part of the dashboard-readability refactor (see the approved plan).

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

apps/ssp/src/app/registratie/infrastructure/dashboard-view.adapter.ts

@@ -1,18 +1,24 @@
 import { Injectable, inject, resource } from '@angular/core';
 import { Result, ok, err } from '@shared/kernel/fp';
 import {
+  ApiClient,
   DashboardViewDto,
+  RegistrationDto,
+  RegistrationStatusDto,
+  PersonDto,
+} from '@shared/infrastructure/api-client';
+import {
+  Registration,
+  RegistrationStatus,
   HerregistratieDecisions,
-} from '@registratie/contracts/dashboard-view.dto';
-import { Registration } from '@registratie/domain/registration';
+} from '@registratie/domain/registration';
 import { Person } from '@registratie/domain/person';
 import { BigProfile } from '@registratie/domain/big-profile';
-import { ApiClient } from '@shared/infrastructure/api-client';
 
 /**
  * The parsed, frontend-side view: the wire DTO mapped onto our own domain model.
- * Lives HERE, not in contracts/, because it references domain types — contracts
- * stays import-free. This split is the decoupling seam (CLAUDE.md §1, ADR-0001).
+ * Lives HERE, not in a `contracts/*.dto.ts` file, because it references domain
+ * types — that split is the decoupling seam (CLAUDE.md §1, ADR-0001).
  */
 export interface DashboardView {
   profile: BigProfile;
@@ -31,17 +37,80 @@ export class DashboardViewAdapter {
 
   // The value is still untrusted JSON — parseDashboardView validates it at the
   // boundary and maps DTO → domain before the app uses it.
-  //
-  // SEAM (G5): retry-with-backoff for non-mutating reads wraps the loader here —
-  // e.g. `loader: () => withBackoff(() => this.client.dashboardView())` — since the
-  // adapter is the single place HTTP lives. Reads are safe to retry; MUTATING calls
-  // (the submit-* commands) must NEVER auto-retry — and don't. Manual retry
-  // (resource.reload via <app-async>) covers the UX today, so backoff stays unbuilt.
   dashboardViewResource() {
     return resource({ loader: () => this.client.dashboardView() });
   }
 }
 
+/** Trust-boundary parse of the status union — the generated `RegistrationStatusDto`
+    flattens all three variants into one object with every field optional (NSwag
+    can't express a discriminated union), so the tag drives which fields must
+    actually be present. Mirrors `parseAanvraagStatus` in `aanvragen.adapter.ts`. */
+export function parseRegistrationStatus(
+  s: RegistrationStatusDto | undefined,
+): Result<string, RegistrationStatus> {
+  if (!s || typeof s.tag !== 'string') return err('registration: missing status');
+  switch (s.tag) {
+    case 'Geregistreerd':
+      if (typeof s.herregistratieDatum !== 'string')
+        return err('registration: bad Geregistreerd status');
+      return ok({ tag: 'Geregistreerd', herregistratieDatum: s.herregistratieDatum });
+    case 'Geschorst':
+      if (typeof s.geschorstTot !== 'string' || typeof s.reden !== 'string')
+        return err('registration: bad Geschorst status');
+      return ok({ tag: 'Geschorst', geschorstTot: s.geschorstTot, reden: s.reden });
+    case 'Doorgehaald':
+      if (typeof s.doorgehaaldOp !== 'string' || typeof s.reden !== 'string')
+        return err('registration: bad Doorgehaald status');
+      return ok({ tag: 'Doorgehaald', doorgehaaldOp: s.doorgehaaldOp, reden: s.reden });
+    default:
+      return err(`registration: unknown status tag ${s.tag}`);
+  }
+}
+
+function parseRegistration(dto: RegistrationDto | undefined): Result<string, Registration> {
+  if (
+    !dto ||
+    typeof dto.bigNummer !== 'string' ||
+    typeof dto.naam !== 'string' ||
+    typeof dto.beroep !== 'string' ||
+    typeof dto.registratiedatum !== 'string' ||
+    typeof dto.geboortedatum !== 'string'
+  ) {
+    return err('dashboard-view: missing/invalid registration');
+  }
+  const status = parseRegistrationStatus(dto.status);
+  if (!status.ok) return status;
+  return ok({
+    bigNummer: dto.bigNummer,
+    naam: dto.naam,
+    beroep: dto.beroep,
+    registratiedatum: dto.registratiedatum,
+    geboortedatum: dto.geboortedatum,
+    status: status.value,
+  });
+}
+
+function parsePerson(dto: PersonDto | undefined): Result<string, Person> {
+  const a = dto?.adres;
+  if (
+    !dto ||
+    typeof dto.naam !== 'string' ||
+    typeof dto.geboortedatum !== 'string' ||
+    !a ||
+    typeof a.straat !== 'string' ||
+    typeof a.postcode !== 'string' ||
+    typeof a.woonplaats !== 'string'
+  ) {
+    return err('dashboard-view: missing/invalid person');
+  }
+  return ok({
+    naam: dto.naam,
+    geboortedatum: dto.geboortedatum,
+    adres: { straat: a.straat, postcode: a.postcode, woonplaats: a.woonplaats },
+  });
+}
+
 /**
  * Trust-boundary parse: validate the untrusted response shape and map the DTO
  * onto our own domain model. Hand-written on purpose — no Zod for a single
@@ -51,43 +120,17 @@ export function parseDashboardView(json: unknown): Result<string, DashboardView>
   if (typeof json !== 'object' || json === null) return err('dashboard-view: not an object');
   const dto = json as Partial<DashboardViewDto>;
 
-  const reg = dto.registration;
-  if (
-    !reg ||
-    typeof reg.bigNummer !== 'string' ||
-    !reg.status ||
-    typeof reg.status.tag !== 'string'
-  ) {
-    return err('dashboard-view: missing/invalid registration');
-  }
-  const person = dto.person;
-  if (!person || !person.adres || typeof person.adres.postcode !== 'string') {
-    return err('dashboard-view: missing/invalid person');
-  }
+  const registration = parseRegistration(dto.registration);
+  if (!registration.ok) return registration;
+  const person = parsePerson(dto.person);
+  if (!person.ok) return person;
   const d = dto.decisions;
   if (!d || typeof d.eligibleForHerregistratie !== 'boolean') {
     return err('dashboard-view: missing/invalid decisions');
   }
 
-  // Map wire → domain. The shapes are identical today, so this reads as an
-  // identity copy — but the TYPES differ (wire DTO vs domain), so the moment the
-  // wire diverges the compiler forces a real mapping here. That's the seam.
-  const registration: Registration = {
-    bigNummer: reg.bigNummer,
-    naam: reg.naam,
-    beroep: reg.beroep,
-    registratiedatum: reg.registratiedatum,
-    geboortedatum: reg.geboortedatum,
-    status: reg.status,
-  };
-  const persoon: Person = {
-    naam: person.naam,
-    geboortedatum: person.geboortedatum,
-    adres: person.adres,
-  };
-
   return ok({
-    profile: { registration, person: persoon },
+    profile: { registration: registration.value, person: person.value },
     decisions: {
       eligibleForHerregistratie: d.eligibleForHerregistratie,
       herregistratieReason: d.herregistratieReason,