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/domain/value-objects/email.spec.ts

@@ -0,0 +1,17 @@
+import { describe, it, expect } from 'vitest';
+import { parseEmail } from './email';
+
+describe('parseEmail', () => {
+  it('accepts a well-formed address and trims it', () => {
+    const r = parseEmail('  naam@voorbeeld.nl ');
+    expect(r.ok).toBe(true);
+    if (r.ok) expect(r.value).toBe('naam@voorbeeld.nl');
+  });
+
+  it('rejects malformed addresses', () => {
+    expect(parseEmail('').ok).toBe(false);
+    expect(parseEmail('naam').ok).toBe(false);
+    expect(parseEmail('naam@voorbeeld').ok).toBe(false);
+    expect(parseEmail('naam @voorbeeld.nl').ok).toBe(false);
+  });
+});