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/shared/layout/page-shell/page-shell.component.ts

@@ -1,22 +1,31 @@
 import { Component, input } from '@angular/core';
 import { HeadingComponent } from '@shared/ui/heading/heading.component';
 import { LinkComponent } from '@shared/ui/link/link.component';
+import { BreadcrumbComponent, BreadcrumbItem } from '@shared/layout/breadcrumb/breadcrumb.component';
 
-/** Template: standard page body — optional back-link, a heading, optional intro,
-    and projected content. Rendered inside the persistent ShellComponent via the
-    router outlet, so it owns only the content (not the header/footer chrome). */
+/** Template: standard page body — optional breadcrumb, optional back-link, a
+    heading, optional intro, and projected content. Rendered inside the persistent
+    ShellComponent via the router outlet, so it owns only the content (not chrome). */
 @Component({
   selector: 'app-page-shell',
-  imports: [HeadingComponent, LinkComponent],
-  styles: [':host{display:block}'],
+  imports: [HeadingComponent, LinkComponent, BreadcrumbComponent],
+  styles: [`
+    :host{display:block}
+    .body--narrow{max-inline-size:var(--app-form-narrow)}
+    .crumb{margin-block-end:var(--rhc-space-max-xl)}
+    .intro{margin-block-end:var(--rhc-space-max-2xl)}
+  `],
   template: `
-    <div [style.max-width]="width() === 'narrow' ? '32rem' : null">
+    <div [class.body--narrow]="width() === 'narrow'">
+      @if (breadcrumb()) {
+        <app-breadcrumb class="crumb" [items]="breadcrumb()!" />
+      }
       @if (backLink()) {
         <p><app-link [to]="backLink()!">← {{ backLabel() }}</app-link></p>
       }
       <app-heading [level]="1">{{ heading() }}</app-heading>
       @if (intro()) {
-        <p class="rhc-paragraph" style="margin-bottom:1.5rem">{{ intro() }}</p>
+        <p class="rhc-paragraph intro">{{ intro() }}</p>
       }
       <ng-content />
     </div>
@@ -28,4 +37,5 @@ export class PageShellComponent {
   backLink = input<string>();
   backLabel = input('Terug naar overzicht');
   width = input<'default' | 'narrow'>('default');
+  breadcrumb = input<BreadcrumbItem[]>();
 }