Add registratie wizard, BFF dashboard-view, contracts/value-objects, and architecture docs

Checkpoint of in-progress work: the registration wizard (address prefill,
DUO diploma lookup, policy questions), decision-DTO contracts, parse-don't-
validate value objects, infrastructure adapters, plus CLAUDE.md and the
architecture/ADR docs.

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

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

@@ -0,0 +1,47 @@
+import { Injectable } from '@angular/core';
+import { httpResource } from '@angular/common/http';
+import { Result, ok, err } from '@shared/kernel/fp';
+import { DashboardViewDto, DashboardView } from '@registratie/contracts/dashboard-view.dto';
+
+/**
+ * Infrastructure adapter for the screen-shaped ("BFF-lite") dashboard endpoint.
+ * ONE call returns registration + person + server-computed decisions.
+ * (In this POC the endpoint is a static mock; the decisions are precomputed to
+ * stand in for what the backend would compute.)
+ */
+@Injectable({ providedIn: 'root' })
+export class DashboardViewAdapter {
+  // Typed as the DTO for ergonomics, but the value is still untrusted JSON —
+  // parseDashboardView validates it at the boundary before the app uses it.
+  dashboardViewResource() {
+    return httpResource<DashboardViewDto>(() => 'mock/dashboard-view.json');
+  }
+}
+
+/**
+ * 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
+ * contract. ponytail: reach for a schema lib once the contract count grows.
+ */
+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 d = dto.decisions;
+  if (!d || typeof d.eligibleForHerregistratie !== 'boolean') {
+    return err('dashboard-view: missing/invalid decisions');
+  }
+
+  return ok({
+    profile: { registration: reg, person },
+    decisions: { eligibleForHerregistratie: d.eligibleForHerregistratie, herregistratieReason: d.herregistratieReason },
+  });
+}