test/docs: harden report-card list e2e + correct badge docstring

Review fixes on the list/map report-card PR:
- e2e precondition now hard-asserts ofsted_rc_date instead of test.skip, so
  the backend dropping the field fails loudly (that's the regression under
  test), not silently skips.
- Use page_size=5 (the real backend param); per_page was ignored and fell
  back to the default page size.
- Update buildOfstedListBadge docstring to describe the ofsted_rc_date-based,
  report-card-wins-first detection instead of the removed framework check.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0146VHeLAWjDVE2B5uU67jCB

e2e/tests/journeys.spec.ts

@@ -86,12 +86,19 @@ test('a report-card school shows a Report Card badge in search results, not its
   // labelled by their old grade (e.g. "Outstanding · 2021"). The list now
   // carries ofsted_rc_date and the badge treats a report card as winning.
   const RC_URN = 138690; // Barclay Primary — has a Nov-2025+ report card
-  const res = await page.request.get(`/api/schools?search=Barclay%20Primary&per_page=5`);
+  const res = await page.request.get(`/api/schools?search=Barclay%20Primary&page_size=5`);
   expect(res.ok()).toBeTruthy();
   const barclay = ((await res.json()).schools ?? []).find(
     (s: { urn: number }) => s.urn === RC_URN,
   );
-  test.skip(!barclay?.ofsted_rc_date, 'precondition: the list must expose ofsted_rc_date for a report-card school');
+  // Hard assertions, not test.skip: if the backend stops exposing
+  // ofsted_rc_date for this report-card school, that IS the regression this
+  // test exists to catch, so it must fail loudly rather than skip.
+  expect(barclay, 'Barclay must appear in the search results').toBeTruthy();
+  expect(
+    barclay.ofsted_rc_date,
+    'the list must expose ofsted_rc_date for a report-card school',
+  ).toBeTruthy();
 
   await searchByName(page, 'Barclay Primary');
   // The Barclay row must be present…