docs: align readme with phase24 evidence surface

Author: Michael John Tilk

README.md

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+# Riverbraid-Action-Gold
+This repository is part of the Riverbraid 30 repository AI governance verification registry.
+## Role
+Riverbraid-Action-Gold provides action boundary review and execution gating support.
+## Verification
+Run:
+    node verify.mjs
+For full cluster verification, see Riverbraid Core:
+    https://github.com/Riverbraid/Riverbraid-Core
+## Evidence Boundary
+This repository participates in Riverbraid's functional starting point for AI governance. It provides inspectable verification logic. It does not claim third party certification, absolute security, or absence of defects.
+## License
+MIT.