Add NannyKeeper MCP server

[imaznation]

Summary

• Adds NannyKeeper MCP server for calculating US household employer (nanny) taxes
• Covers all 50 US states + DC
• Two tools: calculate_nanny_taxes and check_threshold
• Published on npm: @nannykeeper/mcp-server
• Registered on MCP Registry: com.nannykeeper.www/mcp-server

Links

• npm: https://www.npmjs.com/package/@nannykeeper/mcp-server
• Docs: https://www.nannykeeper.com/developers/mcp
• Registry: https://registry.modelcontextprotocol.io

[olaservo]

Thanks for contributing to the MCP servers repo!

We've retired the third-party server list from the README in favor of the MCP Registry — see #3950 for context. The Official Integrations and Community Servers sections no longer exist in the README, so this PR no longer has a target.

Going forward, please publish your server to the MCP Registry using the quickstart guide:
https://github.com/modelcontextprotocol/registry/blob/main/docs/modelcontextprotocol-io/quickstart.mdx

That's where server discovery now happens. Thanks for building on MCP!

---

Note: I'm working through the backlog with help from Claude Code to give everyone a prompt response.