chore: Bump version to 0.5.0

Breaking changes:
- Removed RondevuConnection (replaced by RondevuPeer)
- EventEmitter now uses protected emit()
- Content-based offer IDs (SHA-256 hash)

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

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

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@xtr-dev/rondevu-client",
-  "version": "0.4.1",
+  "version": "0.5.0",
   "description": "TypeScript client for Rondevu topic-based peer discovery and signaling server",
   "type": "module",
   "main": "dist/index.js",