Promote Enterprise-Managed Authorization to stable

Move the extension from specification/draft/ to specification/stable/ to
indicate it is ready for use and has reference implementations. Update the
README to list stable and draft extensions separately, and update the
in-document status banner to match.

Author: pcarleton

README.md

@@ -11,8 +11,13 @@ These extensions are:
 
 ## Extensions
 
+### Stable
+
+- [Enterprise-Managed Authorization](https://github.com/modelcontextprotocol/ext-auth/blob/main/specification/stable/enterprise-managed-authorization.mdx)
+
+### Draft
+
 - [Client Credentials](https://github.com/modelcontextprotocol/ext-auth/blob/main/specification/draft/oauth-client-credentials.mdx)
-- [Enterprise-Managed Authorization](https://github.com/modelcontextprotocol/ext-auth/blob/main/specification/draft/enterprise-managed-authorization.mdx)
 
 ## Governance
 

…aft/enterprise-managed-authorization.mdx …ble/enterprise-managed-authorization.mdxspecification/draft/enterprise-managed-authorization.mdx renamed to specification/stable/enterprise-managed-authorization.mdx specification/draft/enterprise-managed-authorization.mdx renamed to specification/stable/enterprise-managed-authorization.mdx

@@ -2,7 +2,7 @@
 title: Enterprise-Managed Authorization
 ---
 
-<Info>**Protocol Revision**: draft</Info>
+<Info>**Status**: Stable</Info>
 
 ## 1. Introduction