Establish Railiance Fabric graph model

fabric/README.md

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+# Seed Declarations
+
+These declarations are the first repo-local seed graph for Railiance Fabric.
+
+They model current and planned Railiance ecosystem providers:
+
+- OpenBao runtime secrets
+- NetKingdom IAM Profile contract
+- key-cape IAM Profile implementation
+- flex-auth authorization decisions
+- Topaz delegated PDP runtime
+- CloudNativePG PostgreSQL
+- Valkey Redis-compatible cache
+- artifact-store object storage and credential vending
+- State Hub coordination read model
+- repo-scoping scope generation
+
+The files are intentionally small. They are seed data for graph loading,
+validation, and State Hub export work, not a claim that every upstream repo has
+already adopted Fabric declarations as source of truth.