docs(readme): add VS Code one-click and Smithery MCP install

Add a one-click "Install in VS Code" button (uvx --from graphifyy[mcp]
graphify-mcp, no API key) and a Smithery install command for the MCP
server, plus a Smithery badge linking to the server page as the
ownership backlink Smithery verifies.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

README.md

@@ -20,6 +20,7 @@
   <a href="LICENSE"><img src="https://img.shields.io/badge/License-Apache%202.0-blue" alt="License: Apache-2.0"/></a>
   <a href="https://pepy.tech/project/graphifyy"><img src="https://img.shields.io/pepy/dt/graphifyy?color=blue&label=downloads" alt="Downloads"/></a>
   <a href="https://docs.graphify.com"><img src="https://img.shields.io/badge/Docs-docs.graphify.com-0b7285?style=flat&logo=readthedocs&logoColor=white" alt="Docs"/></a>
+  <a href="https://smithery.ai/servers/graphify/graphify"><img src="https://img.shields.io/badge/Smithery-MCP%20server-5c4ee5?style=flat&logo=data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHZpZXdCb3g9IjAgMCAyNCAyNCIgZmlsbD0iI2ZmZiI+PHBhdGggZD0iTTEyIDJMMiA3djEwbDEwIDUgMTAtNVY3eiIvPjwvc3ZnPg==" alt="Smithery"/></a>
   <a href="https://discord.gg/XDnKVpzdXB"><img src="https://img.shields.io/badge/Discord-Join-5865F2?style=flat&logo=discord&logoColor=white" alt="Discord"/></a>
   <a href="https://www.youtube.com/@graphifylabs"><img src="https://img.shields.io/badge/YouTube-Graphify%20Labs-FF0000?style=flat&logo=youtube&logoColor=white" alt="YouTube"/></a>
   <a href="https://www.linkedin.com/company/graphify-labs"><img src="https://img.shields.io/badge/LinkedIn-Graphify%20Labs-0077B5?logo=linkedin" alt="LinkedIn"/></a>
@@ -512,6 +513,19 @@ python -m graphify.serve graphify-out/graph.json --transport http --host 0.0.0.0
 
 The MCP server gives your assistant structured access: `query_graph`, `get_node`, `get_neighbors`, `shortest_path`, `list_prs`, `get_pr_impact`, `triage_prs`.
 
+### One-click install (VS Code · Smithery)
+
+Prefer not to edit MCP config by hand? Register the graphify MCP server in one step. Run `/graphify` first so a `graphify-out/graph.json` exists in the workspace; the server reads it on launch.
+
+[![Install in VS Code](https://img.shields.io/badge/VS_Code-Install_graphify_MCP-0098FF?style=flat-square&logo=visualstudiocode&logoColor=white)](https://insiders.vscode.dev/redirect/mcp/install?name=graphify&config=%7B%22command%22%3A%22uvx%22%2C%22args%22%3A%5B%22--from%22%2C%22graphifyy%5Bmcp%5D%22%2C%22graphify-mcp%22%5D%7D)
+
+The button adds a `graphify` server that launches with `uvx --from "graphifyy[mcp]" graphify-mcp` (no API key, no prior install). Or install via [Smithery](https://smithery.ai/servers/graphify/graphify) for Claude, Cursor, VS Code, and other clients:
+
+```bash
+# pick your client (claude, cursor, vscode, windsurf, ...)
+npx -y @smithery/cli install graphify/graphify --client claude
+```
+
 ### Shared HTTP server
 
 `--transport stdio` (the default) spawns one local server per developer. `--transport http` serves the same tools over the MCP Streamable HTTP transport, so a single shared process can serve the graph for the whole team — clients point their IDE MCP config at `http://<host>:8080/mcp` instead of running graphify locally.