chore: Bump version to 6.0.8

Critical hotfix for PM2 worker startup issue. The worker now correctly
starts from the marketplace directory automatically.

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

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

.claude-plugin/marketplace.json

@@ -10,7 +10,7 @@
   "plugins": [
     {
       "name": "claude-mem",
-      "version": "6.0.7",
+      "version": "6.0.8",
       "source": "./plugin",
       "description": "Persistent memory system for Claude Code - context compression across sessions"
     }