docs: Add EUIPO registration as compliance agent reference test case

Real-world case from EU authority (EUIPO) with 7 findings:
- Grammatically broken consent text (bad DE translation)
- Coupling prohibition violation (login = consent, Art. 7(4) DSGVO)
- No reject button, no granularity, no active opt-in
- Broken link layout (DSE/ToS links appear after submit button)
- Includes correction suggestion and planned agent check implementations
- Pattern: WSO2 Identity Server default templates (systemic issue)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

zeroclaw/tests/reference-cases/README.md

@@ -0,0 +1,13 @@
+# Compliance Agent — Reference Test Cases
+
+Reale Befunde von echten Websites. Jeder Case dokumentiert:
+- Was gefunden wurde
+- Welche Rechtsgrundlage verletzt ist
+- Was der Agent erkennen sollte
+- Wie die Korrektur aussehen muss
+
+## Cases
+
+| Case | Website | Typ | Schwere |
+|------|---------|-----|---------|
+| [EUIPO Registration](euipo-registration-consent.md) | login.euipo.europa.eu | Consent-Text + Koppelungsverbot | HIGH |