# WP-34 — Adres: phone field + BRP address read-only

Status: done
Phase: 7 — refinements

## Why

The "Mijn gegevens" screen let the user _edit_ their address (straat/postcode/woonplaats) and
submit it as an adreswijziging. But the BRP (Basisregistratie Personen) is the authority for a
person's address — you change it at the municipality, not in a register self-service portal.
This WP corrects that: the address is shown **read-only** (rendered from the BRP data the
screen already loads), and the editable/submittable contact detail becomes the **phone number**
— the thing CIBG actually holds and the professional can update here.

## Decisions (made while building — no spec existed; flagged for review)

- **The adreswijziging form becomes a telefoonwijziging form.** Address is read-only display;
  phone is the one editable field. Same single-step machine idiom (Model/Msg/pure reduce +
  value object + submit command) — only the fields changed.
- **New `Telefoonnummer` value object** (parse-don't-validate, lax Dutch format: 10 digits,
  leading 0, `+31`→`0`, formatting stripped). Backend `RejectPhoneChange` re-validates as the
  authority (ADR-0001); the FE check is UX-only. Replaces the old address/`RejectChangeRequest`.
- **Phone starts empty.** There is no current-phone anywhere in BRP/seed/Person, so no
  current-value round-trip was added (YAGNI) — the form submits a new/updated number. The
  read-only BRP address gives the screen its context.
- **Endpoint reused, contract narrowed.** `POST /change-requests` now takes `{ telefoon }`
  (category `telefoonwijziging`); the typed client was regenerated (drift check clean).

## Files

- `registratie/domain/value-objects/telefoonnummer.ts` (+spec) — new value object.
- `registratie/domain/change-request.machine.ts` (+spec) — Draft/Valid now `{ telefoon }`.
- `registratie/infrastructure/change-request.adapter.ts` — sends `{ telefoon }`.
- `registratie/ui/change-request-form/change-request-form.component.ts` (+story) — read-only
  BRP address block + editable phone field; takes `brpAdres` input.
- `registratie/ui/registration-detail.page.ts` — passes `profile()?.person?.adres`.
- Backend: `Dtos.cs`, `Program.cs`, `SubmissionRules.cs` (+ RuleTests/EndpointTests/IdempotencyTests).
- `src/locale/*` — new/changed `$localize` ids + English targets.

## Acceptance criteria

- [x] BRP address rendered read-only with a "change it at your municipality" note.
- [x] Phone field with format validation (client instant + server authoritative).
- [x] `npm run ci` green (lint, format, tokens, 332 FE tests, localized build, backend 122
      tests, api-client drift clean after commit).