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Stamdata: add beroepen, opleidingen (temporal), and specialismen tables to the schema-driven catalog (zero UI code). opleidingen.beroep and specialismen.beroep both reference beroepen.code — the first stamdata->stamdata references, enforced by two new StamdataRef entries in the CI gate. OpenZaak/ZGW (WP-49, slice 1 — read-only zaken): introduce IZaakSource as the cases read seam. Default LocalZaakSource reads the local SQLite store (offline); an OpenZaakZaakSource (Zgw/ client: HS256 per-call JWT, ZGW->existing-DTO mapper, paginating HTTP source) is selected behind Zgw:Enabled (default false). The FE never changes — same ApplicationSummaryDto, no api-client drift. Unit-tested with fixtures + a stub HttpMessageHandler; no live OpenZaak needed. Docs: ADR-0005, reference/openzaak-integration.md, WP-49..52 roadmap, stamdata.md update, README index rows. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>