ci: add changeset

Author: fahreddinozcan

.changeset/yellow-chairs-study.md

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+---
+"@upstash/context7-mcp": minor
+---
+
+Add OAuth 2.0 authentication support for MCP server
+
+- Add new `/mcp/oauth` endpoint requiring JWT authentication
+- Implement JWT validation against authorization server JWKS
+- Add OAuth Protected Resource Metadata endpoint (RFC 9728) at `/.well-known/oauth-protected-resource`
+- Include `WWW-Authenticate` header for OAuth discovery