Bump version to 5.4.3

Release v5.4.3: Fix PM2 race condition in worker restart

Changes:
- Removed PM2 restart logic from ensureWorkerRunning()
- PM2 watch mode now exclusively handles worker restarts
- Eliminated race condition causing TypeError
- Reduced unnecessary worker restarts (39+ → minimal)

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

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

plugin/.claude-plugin/plugin.json

@@ -1,6 +1,6 @@
 {
   "name": "claude-mem",
-  "version": "5.4.2",
+  "version": "5.4.3",
   "description": "Persistent memory system for Claude Code - seamlessly preserve context across sessions",
   "author": {
     "name": "Alex Newman"