chore: add Socket.dev badge with auto-version via release-please

Add Socket.dev security badge to README with x-release-please-version
marker so the badge version updates automatically on each release.

Configure release-please extra-files to include README.md in version
bumps.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: marcstraube

README.md

@@ -5,6 +5,9 @@
 [![License](https://img.shields.io/npm/l/@zappzarapp/browser-utils.svg)](https://www.npmjs.com/package/@zappzarapp/browser-utils)
 [![CI](https://github.com/marcstraube/zappzarapp-node-browser-utils/actions/workflows/ci.yml/badge.svg)](https://github.com/marcstraube/zappzarapp-node-browser-utils/actions/workflows/ci.yml)
 
+<!-- prettier-ignore -->
+[![Socket Badge](https://badge.socket.dev/npm/package/@zappzarapp/browser-utils/1.2.0)](https://badge.socket.dev/npm/package/@zappzarapp/browser-utils/1.2.0) <!-- x-release-please-version -->
+
 Zero-dependency browser utilities with security-first design — type-safe,
 tree-shakeable, and fully tested.
 

release-please-config.json

@@ -6,6 +6,12 @@
       "package-name": "@zappzarapp/browser-utils",
       "bump-minor-pre-major": true,
       "bump-patch-for-minor-pre-major": true,
+      "extra-files": [
+        {
+          "type": "generic",
+          "path": "README.md"
+        }
+      ],
       "changelog-sections": [
         {
           "type": "feat",