docs(openspec): add ADR-001 information architecture

[rubenvdlinde]

Summary

Adds the first per-app architecture ADR for openregister, codifying the information architecture that places all 114 specs onto a stable 8-item top-level menu without inflating it as new capabilities ship.

Distilled from the cross-app brief at /tmp/ia-mydash-openregister.md (openregister section). The sibling mydash ADR is being authored in parallel; both apps follow the same discipline of "menu items are destinations, not features."

Top-level navigation (fixed at 8)

Registers / Schemas / Objects / Integrations / Audit / Workflows / Beheer / API & Docs. The AI chat companion is a global launcher (sidebar pill), not a menu item.

The 5 rules

1. Menu items are data primitives, not features — ABAC, NLX, OpenLineage, PII, CDC, NORA are capabilities of primitives, never menu items.
2. Cross-cutting governance lives in Beheer, organised by topic — exactly 8 tabs (Tenants, Auth, Policies, Environments, Data, Compliance, Observability, System); new governance specs join an existing tab.
3. Every primitive gets a consistent tab template — Registers/Schemas/Objects detail pages have fixed tab orders so the layout is learned once.
4. Specs that affect both an instance and an org-level policy appear in both places — per-register tab edits the instance; Beheer sets defaults.
5. Developer surface (API & Docs) is its own menu, separate from Beheer (platform-ops) — different audiences, different artefacts.

Test plan

• ADR file present at openspec/architecture/adr-001-information-architecture.md
• Rules numbered with Rationale + How-to-apply for each
• Future spec proposals reference this ADR for placement decisions

[github-actions]

Quality Report — ConductionNL/openregister @ 94b8a90

Check	PHP	Vue	Security	License	Tests
lint	✅
phpcs	✅
phpmd	✅
psalm	✅
phpstan	✅
phpmetrics	✅
eslint		❌
stylelint		❌
composer			❌	✅ 147/147
npm			✅	✅ 525/525
PHPUnit					⏭️
Newman					⏭️
Playwright					⏭️

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Quality workflow — 2026-05-23 05:39 UTC

Download the full PDF report from the workflow artifacts.