Establish Railiance Fabric graph model

examples/declarations/README.md

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+# Declaration Fixtures
+
+These fixtures support the T02 schema baseline and give the future validator
+real inputs to exercise.
+
+`valid/` contains a coherent mini-graph:
+
+- OpenBao service
+- OpenBao runtime-secrets capability
+- OpenBao KV v2 interface
+- flex-auth runtime-secrets dependency
+- binding assertion from flex-auth to OpenBao
+
+`invalid/` contains schema-level failures. The future validator should report
+clear errors for these before it attempts graph-level checks.