feat(sdlc): staging environment + automated staging→prod pipeline

- pr-checks.yml: PR gate — frontend typecheck+jest, backend import smoke,
  image builds (no push), Claude AI review posted as PR comment (severe
  findings block merge)
- deploy.yml (replaces build-and-push.yml): merge to main builds+pushes
  images tagged sha-<sha>/staging, deploys the staging Portainer stack via
  webhook, runs Playwright E2E journeys against staging, then retags the
  verified images :prod (previous kept as :prod-previous) and deploys prod
- docker-compose.portainer.staging.yml: second Portainer stack — :staging
  images, sc_staging_* names, own macvlan IPs, Airflow on 8081; data
  bootstrapped from source via the staging Airflow DAGs
- prod compose now pins :prod instead of :latest (only the promotion step
  moves it; :latest is no longer published)
- e2e/: 6 Playwright journeys (search, postcode, detail, compare, rankings)
  driven by BASE_URL — the promotion gate
- scripts/ci/ai_review.py: Claude review with structured JSON findings
- docs/DEPLOY.md: full SDLC doc incl. one-time setup checklist and rollback
- replaced removed 'next lint' with tsc typecheck; fixed stale jest tests
  (slug URLs, N/A formatting, stable trend, fake-timer setup)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PqGhF93UrpDNvXBLMjJENL

e2e/tests/journeys.spec.ts

@@ -0,0 +1,72 @@
+import { test, expect, Page } from '@playwright/test';
+
+/**
+ * Journey tests for SchoolCompare, run against the staging environment as the
+ * gate before promotion to production. They assert stable data invariants
+ * (results exist, key UI renders) rather than exact numbers, so routine data
+ * refreshes don't break the pipeline.
+ */
+
+async function searchByName(page: Page, query: string) {
+  await page.goto('/');
+  const searchInput = page.getByPlaceholder('School name or postcode').first();
+  await searchInput.fill(query);
+  await searchInput.press('Enter');
+  await page.waitForURL(/search=|postcode=/);
+}
+
+function schoolLinks(page: Page) {
+  return page.locator('a[href^="/school/"]');
+}
+
+test('home page loads with hero search', async ({ page }) => {
+  await page.goto('/');
+  await expect(page.locator('h1').first()).toBeVisible();
+  await expect(page.getByPlaceholder('School name or postcode').first()).toBeVisible();
+});
+
+test('searching by name returns school results', async ({ page }) => {
+  await searchByName(page, 'primary');
+  await expect(schoolLinks(page).first()).toBeVisible({ timeout: 15_000 });
+  expect(await schoolLinks(page).count()).toBeGreaterThan(1);
+});
+
+test('searching by postcode returns nearby schools', async ({ page }) => {
+  await searchByName(page, 'B1 1BB');
+  await expect(schoolLinks(page).first()).toBeVisible({ timeout: 15_000 });
+});
+
+test('school detail page renders name and performance data', async ({ page }) => {
+  await searchByName(page, 'primary');
+  const firstSchool = schoolLinks(page).first();
+  await expect(firstSchool).toBeVisible({ timeout: 15_000 });
+  await firstSchool.click();
+  await page.waitForURL(/\/school\//);
+  await expect(page.locator('h1').first()).toBeVisible();
+  // The detail page renders at least one chart canvas (performance history)
+  await expect(page.locator('canvas').first()).toBeVisible({ timeout: 15_000 });
+});
+
+test('comparing two schools shows both side by side', async ({ page }) => {
+  // Collect two school URNs from search results, then load the share URL
+  await searchByName(page, 'primary');
+  await expect(schoolLinks(page).first()).toBeVisible({ timeout: 15_000 });
+  const hrefs = await schoolLinks(page).evaluateAll((links) =>
+    links.map((l) => (l as HTMLAnchorElement).getAttribute('href') || '')
+  );
+  const urns = [...new Set(hrefs.map((h) => h.match(/\/school\/(\d+)/)?.[1]).filter(Boolean))];
+  expect(urns.length).toBeGreaterThanOrEqual(2);
+
+  await page.goto(`/compare?urns=${urns[0]},${urns[1]}`);
+  // Both schools' detail links should render in the comparison view
+  await expect(page.locator(`a[href*="${urns[0]}"]`).first()).toBeVisible({ timeout: 15_000 });
+  await expect(page.locator(`a[href*="${urns[1]}"]`).first()).toBeVisible();
+});
+
+test('rankings page loads a populated table', async ({ page }) => {
+  await page.goto('/rankings');
+  await expect(page.getByRole('heading', { name: /rankings/i }).first()).toBeVisible();
+  const rows = page.locator('table tbody tr');
+  await expect(rows.first()).toBeVisible({ timeout: 15_000 });
+  expect(await rows.count()).toBeGreaterThan(5);
+});