v0.30.1

• Fixed stack overflow on every MCP write call (create_link, disable_link, enable_link, delete_link). The identity getter was returning this.identity and recursing indefinitely; it now returns the authenticated email from the Cloudflare Access props.
• Clarified the create_link MCP tool contract: the description now states that an existing destination URL returns the existing link with duplicate: true instead of failing, so callers no longer need to pre-check availability with search_links. The service-level duplicate flag is now propagated into the MCP response payload.