Adds infra/run-local-flow-check.sh (+ `make verify-local`): submits a
registration against a fresh local stack and asserts it opens a zaak, reaches
the werkbak after documents, and appears in the openbaar register — all with no
manual seeding. Fails today (ACL points at a placeholder zaaktype; the DMN is
undeployed; no NRC abonnement is registered), covering the three S-B04 gaps.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
