docs: add README role and boundary block

README.md

@@ -1,23 +1,49 @@
 # Riverbraid-Refusal-Gold
+
 Riverbraid-Refusal-Gold provides refusal and boundary verification support for the Riverbraid governance floor.
+
 Riverbraid is an open source deterministic integrity floor for AI governance. It is designed to make structure, authority, and drift visible before trust is granted.
+
+## Role in Riverbraid
+
+Riverbraid-Refusal-Gold is a canonical refusal and boundary verification surface within Riverbraid.
+
+## Public verification boundary
+
+This repository is part of the current Evaluation Kit canonical verification registry and focuses on refusal boundaries, invalid transition rejection, and fail closed policy surfaces.
+
+## Evidence boundary
+
+This repository does not claim certification, legal approval, production readiness, absolute security, external audit, complete AI safety, adoption, or absence of defects.
+
 ## Role
+
 This repository participates in the Riverbraid 30 repository AI governance verification registry.
+
 It focuses on refusal boundaries, invalid transition rejection, and fail closed policy surfaces.
+
 ## Verification
+
 Run:
 ```bash
 node verify.mjs
 ```
+
 For full cluster orientation, see:
 ```text
 Riverbraid-Evaluation-Kit
 ```
+
 ## Evidence boundary
+
 This repository provides an inspectable verification surface.
 It does not claim third party certification, legal approval, production readiness, absolute security, absence of defects, external audit, or complete AI safety.
+
 ## Relationship to Riverbraid
+
 Riverbraid-Refusal-Gold is one domain surface within the broader Riverbraid constellation.
 It does not redefine Riverbraid-Core protocol authority and does not replace the Evaluation Kit as the public starting point.
+
 ## License
+
 MIT