fix(doc): add stakpak-agent to Built with rmcp section (#500)

* Add stakpak-agent to Built with rmcp section

* Remove extra formatting

Author: kajogo777

README.md

@@ -132,6 +132,8 @@ See [oauth_support](docs/OAUTH_SUPPORT.md) for details.
 - [rmcp-openapi-server](https://gitlab.com/lx-industries/rmcp-openapi/-/tree/main/crates/rmcp-openapi-server) - High-performance MCP server that exposes OpenAPI definition endpoints as MCP tools
 - [nvim-mcp](https://github.com/linw1995/nvim-mcp) - A MCP server to interact with Neovim
 - [terminator](https://github.com/mediar-ai/terminator) - AI-powered desktop automation MCP server with cross-platform support and >95% success rate
+- [stakpak-agent](https://github.com/stakpak/agent) - Security-hardened terminal agent for DevOps with MCP over mTLS, streaming, secret tokenization, and async task management
+
 
 ## Development