fix(e2e): poll the register by reference, not a shared INGEDIEND cell (refs #78)

The verify stack is shared: earlier verify-projection/verify-domain checks leave
INGEDIEND rows in the register before the e2e submits. A status-only poll
short-circuited on a stale row, then the reference assertion ran against a
not-yet-reloaded page and timed out. Poll (with reload) on this submission's
reference cell instead — stronger, and it directly proves the #78 correlation.
Scope the INGEDIEND/INGESCHREVEN status checks to that reference row too.

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

tests/e2e/registration.spec.ts

@@ -26,19 +26,22 @@ test('DigiD login → submit → public INGEDIEND → approve → public INGESCH
 
   // The openbaar register (anonymous, its own origin) shows the submitted entry once the projection
   // catches up. The projection updates asynchronously (NRC → event-subscriber), and the register loads
-  // on open, so reload until a submitted (INGEDIEND) row appears.
+  // on open, so reload until *this* submission's row appears. We poll on the reference cell (not a
+  // generic INGEDIEND cell): the shared verify stack already holds INGEDIEND rows from earlier checks,
+  // so a status-only poll would short-circuit on a stale row before our row is projected.
   await page.goto('http://openbaar/');
   await expect(page.getByRole('heading', { name: /Openbaar BIG-register/i })).toBeVisible();
-  await expect
-    .poll(async () => {
-      await page.reload();
-      return page.getByRole('cell', { name: 'INGEDIEND' }).count();
-    }, { timeout: 30_000, intervals: [1_000, 2_000, 3_000, 5_000] })
-    .toBeGreaterThan(0);
 
   // #78: the reference shown in the public register must be the exact one the citizen saw on the
   // submit confirmation — no mismatch between the two portals.
-  await expect(page.getByRole('cell', { name: reference })).toBeVisible();
+  await expect
+    .poll(async () => {
+      await page.reload();
+      return page.getByRole('cell', { name: reference }).count();
+    }, { timeout: 30_000, intervals: [1_000, 2_000, 3_000, 5_000] })
+    .toBeGreaterThan(0);
+  await expect(page.getByRole('row', { name: reference }).getByRole('cell', { name: 'INGEDIEND' }))
+    .toBeVisible();
 
   // Approve via the temporary admin endpoint (reached directly on the compose network, as a
   // behandelaar would until the behandel-portal exists — S-12). The zaak is opened off the request
@@ -53,11 +56,12 @@ test('DigiD login → submit → public INGEDIEND → approve → public INGESCH
   const approve = await request.post(`http://domain:8080/registrations/${reference}/approve`);
   expect(approve.status()).toBe(204);
 
-  // The approval flows back to the projection; the openbaar register now shows it as INGESCHREVEN.
+  // The approval flows back to the projection; the openbaar register now shows *our* row (matched by
+  // its reference) as INGESCHREVEN.
   await expect
     .poll(async () => {
       await page.reload();
-      return page.getByRole('cell', { name: 'INGESCHREVEN' }).count();
+      return page.getByRole('row', { name: reference }).getByRole('cell', { name: 'INGESCHREVEN' }).count();
     }, { timeout: 30_000, intervals: [1_000, 2_000, 3_000, 5_000] })
     .toBeGreaterThan(0);
 });