chore: bump version to 6.0.0

Major version bump reflecting significant improvements:
- Enhanced session initialization with live userPrompt updates
- Improved transcript processing and analysis capabilities
- Refactored hooks and SDKAgent for better observation handling

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

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

package.json

@@ -1,6 +1,6 @@
 {
   "name": "claude-mem",
-  "version": "5.5.1",
+  "version": "6.0.0",
   "description": "Memory compression system for Claude Code - persist context across sessions",
   "keywords": [
     "claude",