feat(fp): WP-17 — app-level a11y: route focus, template lint, WCAG checklist

Adds route-change focus management (new page's h1, afterNextRender) plus
scroll-position restoration wired once in app.config.ts; angular-eslint's
templateAccessibility bundle linting every inline template via
processInlineTemplates (verified firing with a planted violation, one real
hit fixed in rich-text-editor); docs/wcag-checklist.md and Foundations/
Accessibility MDX tying the four a11y layers (axe, lint, play tests,
manual checklist) together. The checklist pass already earned its keep —
it found a real 320px overflow in aanvraag-block's warning alert.

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

eslint.config.mjs

@@ -1,4 +1,5 @@
 import tseslint from 'typescript-eslint';
+import angular from 'angular-eslint';
 
 /**
  * Enforces the architecture's working agreements that were previously only
@@ -28,8 +29,18 @@ export default [
     },
     plugins: { '@typescript-eslint': tseslint.plugin },
     rules: { '@typescript-eslint/no-explicit-any': 'error' },
+    // This repo has no .html files — every template is inline. This processor
+    // extracts each component's template string into a virtual `*.html` file,
+    // which the template-a11y block below (`files: ['src/**/*.html']`) then lints.
+    processor: angular.processInlineTemplates,
   },
 
+  // Template a11y (WP-17): the official angular-eslint accessibility bundle
+  // (alt-text, label-has-associated-control, click/mouse-events-have-key-events,
+  // interactive-supports-focus, valid-aria, no-autofocus, and more) linting the
+  // virtual `.html` files the processor above extracts from inline templates.
+  ...angular.configs.templateAccessibility.map((c) => ({ ...c, files: ['src/**/*.html'] })),
+
   // Tests legitimately use `any` to feed invalid messages/states into reducers.
   {
     files: ['src/**/*.spec.ts'],