feat(a11y): WP-01 — axe-on-every-story CI gate

Turn the interactive Storybook a11y addon into a build gate:
- @storybook/test-runner + axe-playwright over the static build
  (.storybook/test-runner.ts reads the a11y tags from story context)
- test-storybook / test-storybook:ci scripts; storybook-a11y CI job
- triage: escape-hatch a11y.disable on stories whose display:contents
  wrapper splits <ul>/<li> or <dl>/<dt>/<dd> (structural, deferred to
  WP-11/WP-12, each with justification + cross-ref)
- fix trivial violations: footer/wizard-shell contrast, text-input label,
  wizard stories missing provideApiClient

Verified: broken story fails the gate; 133 stories pass.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/app/registratie/ui/aanvraag-block/aanvraag-block.stories.ts

@@ -22,6 +22,12 @@ const meta: Meta<AanvraagBlockComponent> = {
     // A row is an <li> — the keuzelijst styling needs the real list context.
     template: `<ul class="keuzelijst__list"><app-aanvraag-block [aanvraag]="aanvraag" /></ul>`,
   }),
+  parameters: {
+    // Structural: app-aanvraag-block's host sits between the keuzelijst <ul> and its <li>
+    // — axe's list/listitem rule needs them adjacent regardless of `display:contents`.
+    // WP-11 (CIBG markup fidelity) reworks this markup; see docs/backlog/WP-11-markup-fidelity.md.
+    a11y: { disable: true },
+  },
 };
 export default meta;
 type Story = StoryObj<AanvraagBlockComponent>;

src/app/registratie/ui/registratie-wizard/registratie-wizard.stories.ts

@@ -1,6 +1,7 @@
 import type { Meta, StoryObj } from '@storybook/angular';
 import { applicationConfig } from '@storybook/angular';
 import { provideHttpClient } from '@angular/common/http';
+import { provideApiClient } from '@shared/infrastructure/api-client.provider';
 import { RegistratieWizardComponent } from './registratie-wizard.component';
 import { Draft, RegistratieState, ValidRegistratie } from '@registratie/domain/registratie-wizard.machine';
 import { initialUpload } from '@shared/upload/upload.machine';
@@ -25,7 +26,7 @@ const validData: ValidRegistratie = {
 const meta: Meta<RegistratieWizardComponent> = {
   title: 'Registratie/RegistratieWizard',
   component: RegistratieWizardComponent,
-  decorators: [applicationConfig({ providers: [provideHttpClient()] })],
+  decorators: [applicationConfig({ providers: [provideHttpClient(), provideApiClient()] })],
 };
 export default meta;
 type Story = StoryObj<RegistratieWizardComponent>;

src/app/registratie/ui/registration-summary/registration-summary.stories.ts

@@ -13,6 +13,11 @@ const base = {
 const meta: Meta<RegistrationSummaryComponent> = {
   title: 'Organisms/Registration Summary',
   component: RegistrationSummaryComponent,
+  parameters: {
+    // Structural: app-data-row's host sits between the <dl> and its <dt>/<dd> —
+    // fixed by the WP-12 Datablock rework. See docs/backlog/WP-12-datablock.md.
+    a11y: { disable: true },
+  },
 };
 export default meta;
 type Story = StoryObj<RegistrationSummaryComponent>;