Refactor worker scripts to improve logging and error handling

- Updated `new-hook.js` and `save-hook.js` to enhance logging functionality, including better error messages and structured logging.
- Improved the handling of worker startup in `summary-hook.js` and `worker-utils.ts`, ensuring proper directory context for PM2.
- Added checks for worker health and streamlined session management across hooks.

src/shared/worker-utils.ts

@@ -56,7 +56,9 @@ async function startWorker(): Promise<boolean> {
     }
 
     // Start using PM2 with the ecosystem config
+    // CRITICAL: Must set cwd to pluginRoot so PM2 starts from marketplace directory
     execSync(`pm2 start "${ecosystemPath}"`, {
+      cwd: pluginRoot,
       stdio: 'pipe',
       encoding: 'utf-8'
     });