docs: ChatGPT plugin badge in the README and a plugin section in the user guide (#4438)

Co-authored-by: r <r@x>

README.md

@@ -16,6 +16,7 @@
 <br>
 <a href="https://github.com/ruvnet/claude-flow"><img src="https://raw.githubusercontent.com/ruvnet/ruflo/d1e80400bdefe01d3b13e70395f88fffab76bb18/docs/assets/readme/badges/claude.svg" width="300" height="76" alt="Claude Code plugin"></a>
 <a href="https://www.npmjs.com/package/@claude-flow/codex"><img src="https://raw.githubusercontent.com/ruvnet/ruflo/d1e80400bdefe01d3b13e70395f88fffab76bb18/docs/assets/readme/badges/codex.svg" width="300" height="76" alt="Codex plugin"></a>
+<a href="https://chatgpt.com/plugins/plugin_asdk_app_6ab674ff53c48191bb37040c343e31f3"><img src="docs/assets/readme/badges/chatgpt.svg" width="300" height="76" alt="ChatGPT plugin: RuFlo Federation"></a>
 </p>
 
 </div>

docs/USERGUIDE.md

@@ -1471,6 +1471,10 @@ Click **Refresh** in the MCP settings to connect. Windsurf supports up to 100 MC
 <details>
 <summary>🤖 <strong>ChatGPT</strong></summary>
 
+**RuFlo Federation plugin (no server to run):** Ruflo is available in ChatGPT as a plugin. Open [RuFlo Federation in ChatGPT](https://chatgpt.com/plugins/plugin_asdk_app_6ab674ff53c48191bb37040c343e31f3) and add it to your workspace. It connects to the hosted endpoint `https://x.ruv.io/chatgpt/mcp` with OAuth 2.0 (PKCE) and exposes 12 tools for federation status, audit, publishing and work triage; administrative membership tools and secret-bearing inputs are not exposed. Submission details are in [`chatgpt-plugin/`](../chatgpt-plugin/README.md).
+
+**Or connect your own MCP server.**
+
 **Requires:** ChatGPT Pro or Plus subscription with Developer Mode enabled
 
 **Setup:**

docs/assets/readme/badges/chatgpt.svg

@@ -0,0 +1 @@
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