docs: add Using with a Gateway section to README

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: charlieseay

README.md

@@ -169,6 +169,12 @@ claude mcp add binnacle -- binnacle serve
 - Xcode 16.3+ (build only)
 - Calendar and Reminders access granted via setup command
 
+## Using with a Gateway
+
+If you're running multiple MCP servers, route them through a gateway like [`tbxark/mcp-proxy`](https://github.com/tbxark/mcp-proxy) to manage all child processes from a single persistent service. The proxy handles process lifecycle, centralized config, and crash recovery — each server still gets its own SSE endpoint but you manage everything from one config file instead of scattered Claude Code entries.
+
+For a full walkthrough of how this works in practice, see [The Hidden Cost of a Loaded MCP Stack](https://charlieseay.com/blog/mcp-gateway-lazy-loading) on charlieseay.com.
+
 ## License
 
 MIT — see [LICENSE](LICENSE).