feat(fp): WP-13 — CIBG-gap register + hygiene + MDX

Mark every hand-rolled shared/ui surface with a `// CIBG-GAP EXTENSION:`
comment + `cibgGap` story parameter (skeleton, spinner, rich-text-editor,
wizard-shell's error summary, application-link's non-navigating row,
debug-state, status-badge, card, placeholder-chip) so deviations from the
CIBG design system are auditable. Add the register MDX
(Foundations/CIBG Gap Register), cross-linked from ADR-0003. Delete the
near-identity upload-status-banner wrapper; its one consumer now uses
<app-alert> directly (a story added to keep the info-banner state covered).

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

src/app/shared/layout/wizard-shell/wizard-shell.stories.ts

@@ -15,6 +15,15 @@ const meta: Meta<WizardShellComponent> = {
         <div wizardSuccess><p class="rhc-paragraph">Uw aanvraag is ontvangen.</p></div>
       </app-wizard-shell>`,
   }),
+  parameters: {
+    cibgGap: true,
+    docs: {
+      description: {
+        component:
+          'CIBG-gap extension (error summary only) — see Foundations/CIBG Gap Register.',
+      },
+    },
+  },
 };
 export default meta;
 type Story = StoryObj<WizardShellComponent>;