## What & why
Before this change the self-service confirmation and the openbaar register showed **different** identifiers, so a citizen could not look their registration back up (#78). Now both surface the same **reference**:
- **domain → ACL (write):** the domain `registrationId` is set as the zaak's `identificatie` on `POST /zaken`.
- **event-subscriber → ACL (read):** the subscriber reads the zaak's `identificatie` back through the ACL (§8.1 — only the ACL talks to ZGW) via a new `POST /zaken/reference`, and stores it on the projection row **and** the `processed_notifications` replay log.
- **BFF + openbaar:** the public view exposes `id/status/reference` (never bsn/naam) and searches by id or reference; the register's "Referentie" column shows the reference.
Storing the reference in the replay log keeps ADR-0008's **rebuild-is-log-only** invariant intact — `/admin/rebuild` reproduces the reference without re-reading the ACL.
Decision recorded in **ADR-0012**.
## Definition of Done
- [x] Linked issue: #78
- [x] Tests written first; red → green per layer
- [x] Unit + acceptance green (`make unit`): domain 49, acl 27, bff 20, event-subscriber 19, acceptance 7
- [x] Frontend lint + test green (`nx run-many -t lint test`)
- [x] Mutation ≥ break(90): acl 100%, event-subscriber 100%, bff 100%, domain 98.41% (pre-existing FlowableWorkflowClient baseline, untouched)
- [x] e2e extended: confirmation reference == register reference
- [x] openapi.json + api-client regenerated (drift guard green)
- [x] ADR-0012 added; demo-script note appended
- [x] `Acl__BaseUrl` wired for the subscriber in compose
closes#78
Reviewed-on: #79
Document typed responses (202 SubmitAccepted / 400 / 401 on self-service; 200
OpenbaarEntry[] on openbaar) so the generated spec carries real schemas for S-08's
client. A document transformer clears the auto-populated servers block so the spec
is host-independent and deterministic. Commit services/bff/openapi.json and add a
test asserting it matches the served /openapi/v1.json (fails on drift).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Failing tests for the BFF walking-skeleton endpoints:
- POST /self-service/registrations rejects missing/malformed/wrong-key/expired
tokens (401) and, with a valid digid token, forwards the bsn to the domain and
returns 202 (WebApplicationFactory + a local test signing key, ADR-0010).
- GET /openbaar/register serves public-safe rows anonymously (never the bsn) and
filters by q.
- OpenbaarProjection.PublicView (pure) filters by id and maps to id+status only.
Endpoints and PublicView are stubs so the tests compile and fail on their
assertions; the green commit implements them.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
