Enhance ecosystem configuration and worker service for improved stability

- Document intentional watch mode in ecosystem config for auto-restart on plugin updates.
- Implement auto-session creation in worker service to preserve observation data, ensuring no loss of valuable information during hook failures.
- Address race condition concerns in worker startup and improve error handling in hooks.

ecosystem.config.cjs

@@ -13,6 +13,16 @@ module.exports = {
   apps: [{
     name: 'claude-mem-worker',
     script: './plugin/scripts/worker-service.cjs',
+    // INTENTIONAL: Watch mode enables auto-restart on plugin updates
+    //
+    // Why this is enabled:
+    // - When you run `npm run sync-marketplace` or rebuild the plugin,
+    //   files in ~/.claude/plugins/marketplaces/thedotmack/ change
+    // - Watch mode detects these changes and auto-restarts the worker
+    // - Users get the latest code without manually running `pm2 restart`
+    //
+    // This is a feature, not a bug - it ensures users always run the
+    // latest version after plugin updates.
     watch: true,
     ignore_watch: [
       'node_modules',