feat: add graceful shutdown handling to WorkerService

src/services/worker-service.ts

@@ -250,6 +250,7 @@ export class WorkerService {
   // Initialization flags for MCP/SDK readiness tracking
   private mcpReady: boolean = false;
   private initializationCompleteFlag: boolean = false;
+  private isShuttingDown: boolean = false;
 
   // Service layer
   private dbManager: DatabaseManager;
@@ -595,6 +596,27 @@ export class WorkerService {
 
     logger.info('SYSTEM', 'Worker started', { host, port, pid: process.pid });
 
+    // Register signal handlers to ensure cleanup on exit
+    const handleShutdown = async (signal: string) => {
+      if (this.isShuttingDown) {
+        logger.warn('SYSTEM', `Received ${signal} but shutdown already in progress`);
+        return;
+      }
+      this.isShuttingDown = true;
+
+      logger.info('SYSTEM', `Received ${signal}, shutting down...`);
+      try {
+        await this.shutdown();
+        process.exit(0);
+      } catch (error) {
+        logger.error('SYSTEM', 'Error during shutdown', {}, error as Error);
+        process.exit(1);
+      }
+    };
+
+    process.on('SIGTERM', () => handleShutdown('SIGTERM'));
+    process.on('SIGINT', () => handleShutdown('SIGINT'));
+
     // Do slow initialization in background (non-blocking)
     this.initializeBackground().catch((error) => {
       logger.error('SYSTEM', 'Background initialization failed', {}, error as Error);