Remove prettier-check in favor of native prettier --check

Fixes 3 high severity npm audit vulnerabilities (cross-spawn ReDoS)
by removing the outdated prettier-check package which depended on
vulnerable versions of execa and cross-spawn.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <[email protected]>

Author: bfirsh

package-lock.json

@@ -13,7 +13,7 @@
   "scripts": {
     "build": "webpack",
     "typecheck": "tsc --noEmit",
-    "test": "npm run typecheck && prettier-check src/**/*.js && mocha ./test/*.spec.js",
+    "test": "npm run typecheck && prettier --check src/**/*.js && mocha ./test/*.spec.js",
     "test:watch": "mocha -w ./test/*.spec.js",
     "prepublish": "npm run build",
     "format": "prettier --write src/**/*.js"
@@ -26,7 +26,6 @@
     "eslint-webpack-plugin": "^5.0.2",
     "mocha": "^11.7.1",
     "prettier": "^3.6.2",
-    "prettier-check": "^2.0.0",
     "sinon": "^21.0.0",
     "terser-webpack-plugin": "^5.3.10",
     "typescript": "^5.8.3",