Fix EventEmitter for cross-platform compatibility (v0.18.3)

Replace Node.js 'events' module with 'eventemitter3' package
to ensure compatibility in both browser and Node.js environments.

Changes:
- Replace import from 'events' to 'eventemitter3'
- Add eventemitter3 as dependency
- Remove @types/node (no longer needed)

Fixes browser bundling error where 'events' module was not available.

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

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

package.json

@@ -25,7 +25,6 @@
   "license": "MIT",
   "devDependencies": {
     "@eslint/js": "^9.39.1",
-    "@types/node": "^25.0.2",
     "@typescript-eslint/eslint-plugin": "^8.48.1",
     "@typescript-eslint/parser": "^8.48.1",
     "eslint": "^9.39.1",
@@ -42,6 +41,7 @@
     "README.md"
   ],
   "dependencies": {
-    "@noble/ed25519": "^3.0.0"
+    "@noble/ed25519": "^3.0.0",
+    "eventemitter3": "^5.0.1"
   }
 }