Add citeguard to Research section

MCP server (with a companion Python CLI/library and GitHub Action) that
checks citations against Crossref for retraction/correction status
before they're used in research or writing. Detection logic verified
against real Crossref API data for known cases (Wakefield 1998,
Surgisphere 2020), not just documentation. No API key required.

README.md

@@ -2858,6 +2858,7 @@ Tools for conducting research, surveys, interviews, and data collection.
 - [smaniches/semantic-scholar-mcp](https://github.com/smaniches/semantic-scholar-mcp) [![smaniches/semantic-scholar-mcp MCP server](https://glama.ai/mcp/servers/smaniches/semantic-scholar-mcp/badges/score.svg)](https://glama.ai/mcp/servers/smaniches/semantic-scholar-mcp) 🐍 🏠 ☁️ 🍎 🪟 🐧 - Semantic Scholar MCP server: 14 typed tools over 200M+ academic papers — search, paper/author retrieval, citation-graph traversal, and recommendations. `uvx s2-mcp-server`
 - [thinkchainai/agentinterviews_mcp](https://github.com/thinkchainai/agentinterviews_mcp) - Conduct AI-powered qualitative research interviews and surveys at scale with [Agent Interviews](https://agentinterviews.com). Create interviewers, manage research projects, recruit participants, and analyze interview data through MCP.
 - [vassiliylakhonin/agenda-intelligence-md](https://github.com/vassiliylakhonin/agenda-intelligence-md) [![vassiliylakhonin/agenda-intelligence-md MCP server](https://glama.ai/mcp/servers/vassiliylakhonin/agenda-intelligence-md/badges/score.svg)](https://glama.ai/mcp/servers/vassiliylakhonin/agenda-intelligence-md) 🐍 🏠 - Auditable strategic-risk memos for AI agents — sanctions, regulatory, geopolitics, trade. Geography-routed regional specialists (Central Asia/Caspian, Gulf/Middle East), per-claim evidence discipline, schema-validated output, machine-verified audit. No live data retrieval. PyPI: `agenda-intelligence-md`.
+- [wedo911/citeguard](https://github.com/wedo911/citeguard) 🐍 📇 🏠 - Check a citation against Crossref for retraction, correction, or expression-of-concern status before it goes into a paper, summary, or review — catches papers like Wakefield's retracted MMR-autism study, still cited 1,000+ times since its 2010 retraction. No API key required. Detection logic (checked against real Crossref data, not just documentation) is shared identically between a Python CLI/library, this MCP server, and a GitHub Action for CI.
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 - [xmpuspus/ph-civic-data-mcp](https://github.com/xmpuspus/ph-civic-data-mcp) [![xmpuspus/ph-civic-data-mcp MCP server](https://glama.ai/mcp/servers/xmpuspus/ph-civic-data-mcp/badges/score.svg)](https://glama.ai/mcp/servers/xmpuspus/ph-civic-data-mcp) 🐍 ☁️ 🍎 🪟 🐧 - Philippine government data as agent-callable tools: PHIVOLCS earthquakes + volcano alerts, PAGASA weather + typhoons, PhilGEPS procurement, PSA 2020 Census population + poverty, AQICN air quality. Install: `uvx ph-civic-data-mcp`.
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