docs(e2e): the happy path's public statuses now come from the register (refs #153)

Comment only — the assertions were already reference-matched and hold unchanged. Names the
new chain (ACL → Objecten → NRC → event-subscriber → projection) so the INGEDIEND assertion
reads as the proof of the re-source that it now is.

tests/e2e/registration.spec.ts

@@ -1,11 +1,16 @@
 import { expect, request, test } from '@playwright/test';
 
-// Walking-skeleton happy path (S-08d + S-09 + S-09b + S-12 + S-10a): a zorgprofessional logs in via
+// Walking-skeleton happy path (S-08d + S-09 + S-09b + S-12 + S-10a + S-19b-2): a zorgprofessional
-// mock DigiD and submits through the self-service portal → BFF → domain; the entry appears in the
+// logs in via mock DigiD and submits through the self-service portal → BFF → domain; the entry
-// openbaar register as INGEDIEND; the citizen supplies the documents the process is waiting for
+// appears in the openbaar register as INGEDIEND; the citizen supplies the documents the process is
-// (S-10a); a behandelaar then logs in to the behandel portal, finds the registration in the werkbak,
+// waiting for (S-10a); a behandelaar then logs in to the behandel portal, finds the registration in
-// and approves it (goedkeuren); the decision completes the Flowable Beoordelen task and flows via the
+// the werkbak, and approves it (goedkeuren); the decision completes the Flowable Beoordelen task and
-// ACL → NRC → event-subscriber → projection, and the openbaar register shows INGESCHREVEN.
+// flows via the ACL → Objecten → NRC → event-subscriber → projection, and the openbaar register
+// shows INGESCHREVEN.
+//
+// Since ADR-0030 both public statuses come from the register in Objecten, not from ZGW zaak events:
+// the ACL writes the record on submit (INGEDIEND) and upserts it on approval (INGESCHREVEN), so the
+// INGEDIEND assertion below is itself proof of the re-sourced path.
 test('DigiD submit → public INGEDIEND → documenten → behandelaar goedkeurt → public INGESCHREVEN', async ({
   page,
   context,