Bump version to 2.1.3

Enhanced update command for seamless v2.1.2+ migration.
Existing users can now upgrade and get root CLAUDE.md automatically.

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

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

Author: YAYLABS-Snoo

package.json

@@ -1,6 +1,6 @@
 {
   "name": "codesyncer",
-  "version": "2.1.2",
+  "version": "2.1.3",
   "description": "AI-powered multi-repository collaboration system - Works with Claude Code, Cursor, GitHub Copilot, and more",
   "keywords": [
     "ai-collaboration",