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docs(architecture): import the FDS architecture decisions from the lab repo (closes #159) (#160)
## What & why

Brings the engineer-facing FDS documentation next to the code it describes. Imported from `projects/open-register-fd/` in `Respellion/innovation-lab` and translated to Dutch: **six ADRs**, the ADR index and template, the **L3 component view**, and the **slice-1 proposal**.

The architecture blueprint, the FDS gap analysis and the two privacy views stay in the lab repo — the OKRs cite them and they feed tender responses. Each side names the split in a "Wat ligt waar" table, so nothing is documented twice.

Closes #159

### Why `docs/architecture/fds/` and not `docs/architecture/`

This repo's own ADR series now runs `adr-0001-loose-coupling` … `adr-0010-bff-oidc`. The imported set is numbered 0001–0006, so a flat import would collide across the whole imported range. The subfolder preserves the imported numbering, and with it roughly thirty `ADR-000N` cross-references inside the imported text that would otherwise all need rewriting.

In the MkDocs sidebar the imported six appear as **FDS ADR-000N** so they are not confused with this repo's series. `docs/architecture/fds/README.md` explains the two series.

### Mermaid support was missing

`pymdownx.superfences` had no `custom_fences`, so the imported diagrams would have published to Gitea Pages as raw code blocks. This PR adds the mermaid custom fence, the nav group, and one link under *Where to go* in the docs index.

## Definition of Done

- [x] Linked Gitea issue (above).
- [ ] Failing test committed before the implementation. — n/a, documentation only.
- [ ] Implementation makes the test pass. — n/a, documentation only.
- [x] Conventional Commits referencing the issue (`refs #159`).
- [x] Rebased on current `main`; no conflicts.
- [ ] CI green — n/a for content; the docs verification is below.
- [ ] `docker compose up` reaches green health checks. — n/a, no runtime change.
- [x] Docs updated if behaviour, contracts, or operations changed.
- [x] ADR added in `docs/architecture/` if a non-obvious decision was made. — six imported, plus the numbering decision recorded in the folder README.
- [ ] Demo note in `docs/demo-script.md`. — n/a, nothing user-visible.

## Verification run

- `mkdocs build` — clean. No missing-nav warning for any `architecture/fds/` entry. The two remaining warnings are pre-existing on `main` and untouched here: the set of pages absent from `nav`, and a broken link in `runbooks/ci.md` to `services/acl/stryker-config.json`.
- Mermaid renders as a diagram, not a code block: `site/architecture/fds/c4-component-view/index.html` contains `class="mermaid"`.
- All relative markdown links in the repo resolve.

## Notes for reviewers

- **Language.** The imported documents are Dutch; this repo's own documents remain English. Deliberate, not an oversight — the lab repo standardised on Dutch and these pages moved with it. Translating the rest is a separate decision.
- **Ownership.** This repo sits in the `eho/` namespace while it now holds the canonical FDS architecture decisions that tender answers point at. Worth deciding whether it should move to `Respellion/`.
- **Scope drift, not fixed here.** The imported text is faithful to its source, so the slice-1 proposal and the ADRs assume NHR/KVK for slice 1, while the lab-side blueprint still uses BAG as its example register. The lab-side documents carry a banner about this; Blueprint v2 (slice 5) is where the diagrams get corrected.
- **Companion PR:** `Respellion/innovation-lab` #34 holds the lab-side half of this split.Reviewed-on: #160
2026-09-03 12:35:01 +00:00

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# FDS-architectuur — Open Register
Deze map bevat de architectuurbesluiten en de engineer-documentatie voor de FDS-kant van deze
referentie-applicatie: deelnemen aan het Federatief Datastelsel als **afnemer**.
De strategische inzet, de slices en de portfoliostatus staan in het Innovation Lab-repo,
`Respellion/innovation-lab`, onder `projects/open-register-fd/`. Daar staan ook de
architectuurblauwdruk, de FDS gap-analyse en de privacy-views.
## Documenten
| Document | Waarvoor |
|---|---|
| [`c4-component-view.md`](c4-component-view.md) | Componentview op niveau 3: ports en adapters, en welke views nog waarde toevoegen |
| [`slice-1-proposal.md`](slice-1-proposal.md) | Het bouwbare eerste increment; plak dit in een `poc-voorstel`-issue |
| `adr/` | De geaccepteerde architectuurbesluiten, ADR-0001 tot en met ADR-0006. Zie de tabel hieronder. |
## Architecture Decision Records
Een ADR legt een besluit vast dat **vaststaat**, met de context en de gevolgen, zodat het niet stil
opnieuw wordt uitgevochten. Statuswaarden: `proposed``accepted` → (`vervangen door ADR-NNNN` |
`deprecated`).
Een geaccepteerde ADR wijzigen betekent een nieuwe ADR schrijven die de oude vervangt. Wij
herschrijven de historie nooit.
ADRs liggen naast governance. Acceptatie volgt de asynchrone bezwaarronde uit
`Respellion/innovation-lab`, `operating-model/operating-model.md`, sectie *Besluitvorming*.
| ADR | Besluit | Status |
|---|---|---|
| [0001](adr/0001-acl-at-every-register-boundary.md) | Anti-Corruption Layer op elke registergrens | accepted |
| [0002](adr/0002-fsc-for-connectivity.md) | FSC voor connectiviteit tussen organisaties, geen ruwe REST | accepted |
| [0003](adr/0003-pbac-via-opa.md) | Policy-based access control via OPA, FTV-klaar | accepted |
| [0004](adr/0004-bounded-cache.md) | Begrensde cache; registers blijven systeem van registratie | accepted |
| [0005](adr/0005-ldv-verwerkingenlog.md) | Verwerkingenlog via event-emissie, in lijn met LDV | accepted |
| [0006](adr/0006-module-boundary-and-reuse.md) | Modulegrens en hergebruikstrategie: in-process → .NET-module → OpenMetadata-feed → gateway op verzoek | accepted |
## Nummering
Deze reeks staat los van de ADR-reeks over de referentie-applicatie zelf, die in
[`../`](../adr-0001-loose-coupling.md) loopt van `adr-0001-loose-coupling` tot en met
`adr-0010-bff-oidc`. Vandaar de eigen map `fds/`: beide reeksen beginnen bij 0001, en de nummers
zouden anders over de volle breedte botsen.
In de MkDocs-navigatie staan deze zes daarom als **FDS ADR-000N**, zodat de zijbalk ze niet met de
reeks van de applicatie verwart.
Nieuwe FDS-ADR: kopieer [`adr/template.md`](adr/template.md), neem het volgende nummer, en open een
pull request.