Adds CONSENT_GRANT, CONSENT_WITHDRAW, RESTRICT, UNRESTRICT to the
AuditAction closed enum per GDPR Art. 7 and Art. 18 requirements.
core-consent and core-dsr optional cores (Epic B Stories 03/06) emit
these action types via core-audit's IAuditLog channel; the values must
exist in core-shared's enum before either optional core can be built.
No change to IAuditLog's interface surface — new values flow through
AuditEntry.action automatically.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>