assertPublishGuardsSatisfied() runs additively after the existing
assertRequiredBindingsPresent() check. Failures are collected (not
first-fail) so PublishGuardViolationException carries the full list
to the builder UI in one 422 response.
PurposeRequirementsNotMetException remains for missing bindings;
PublishGuardViolationException covers semantic constraints
(is_identity_key flag, no-ambiguous-trust, append-collection-only,
section-aware schemas, conditional triggers).
Two pre-existing tests updated their fixtures to satisfy the new
guards (PublishChecksRelationalBindingsTest +
PurposeSchemaLifecycleTest): EMAIL field type + is_identity_key on
person.email + unique trust levels are now required for
event_registration to publish.
Refs: RFC-WS-6.md §3 (Q13)
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>