Implement canonical schema foundation

examples/caring/access_descriptor.yaml

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+id: descriptor:tenant-alpha-document-reader
+profile: caring-0.4.0-rc2
+subject_type: Human
+organization_relation: Customer
+canonical_role: Doer
+scope:
+  level: Resource
+  id: document:internal-note
+  tenant: tenant:alpha
+  resource: document:internal-note
+planes:
+  - Data
+capabilities:
+  - View
+exposure_modes:
+  - Masked
+  - Plaintext
+conditions:
+  - PurposeBound
+  - Logged
+lifecycle_state: Operate
+restrictions:
+  - ExportBlocked
+access_path: direct
+metadata:
+  source: examples/caring