chore: bump version to 0.5.2

Parser 성능 최적화 릴리즈:
- Sync Parser: +20.67% 향상 (State Machine)
- Async Parser: ~15% 향상 (Circular Buffer Queue)

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

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

Author: Clickin

package.json

@@ -1,6 +1,6 @@
 {
   "name": "stax-xml-monorepo",
-  "version": "0.5.1",
+  "version": "0.5.2",
   "private": true,
   "description": "Monorepo for stax-xml library, benchmarks, and documentation",
   "author": "Clickin <josh87786@gmail.com>",

packages/stax-xml/package.json

@@ -1,6 +1,6 @@
 {
   "name": "stax-xml",
-  "version": "0.5.1",
+  "version": "0.5.2",
   "author": "Clickin <josh87786@gmail.com>",
   "repository": {
     "type": "git",