Move platform badges to separate row in README

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

README.md

@@ -9,6 +9,7 @@
 [![npm version](https://img.shields.io/npm/v/@colbymchenry/codegraph.svg)](https://www.npmjs.com/package/@colbymchenry/codegraph)
 [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)
 [![Node.js](https://img.shields.io/badge/Node.js-18+-green.svg)](https://nodejs.org/)
+
 [![Windows](https://img.shields.io/badge/Windows-supported-blue.svg)](#)
 [![macOS](https://img.shields.io/badge/macOS-supported-blue.svg)](#)
 [![Linux](https://img.shields.io/badge/Linux-supported-blue.svg)](#)