Implement canonical schema foundation

schemas/README.md

@@ -3,9 +3,13 @@
 JSON Schema definitions for flex-auth's canonical artefacts:
 
 - `resource_manifest.schema.json` (pinned in `FLEX-WP-0005 P5.3`)
+- `protected_system_manifest.schema.json`
 - `subject_manifest.schema.json`
 - `relationship_fact.schema.json`
-- `policy_package_frontmatter.schema.json`
+- `caring_profile.schema.json`
+- `caring_access_descriptor.schema.json`
+- `policy_package.schema.json`
+- `policy_fixture.schema.json`
 - `check_request.schema.json`
 - `decision_envelope.schema.json`
 - `audit_event.schema.json`