feat: scaffold worker application shell

Adds apps/worker with TypeScript config, BullMQ/ioredis dependencies,
pino logger bootstrap, and a smoke test. Queue consumers wired in later phases.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

apps/worker/jest.config.js

@@ -0,0 +1,6 @@
+module.exports = {
+  preset: 'ts-jest',
+  testEnvironment: 'node',
+  testMatch: ['**/*.test.ts'],
+  rootDir: 'src',
+};

apps/worker/package.json

@@ -0,0 +1,25 @@
+{
+  "name": "@tower/worker",
+  "version": "0.0.1",
+  "scripts": {
+    "build": "tsc",
+    "dev": "ts-node src/main.ts",
+    "start": "node dist/main.js",
+    "test": "jest"
+  },
+  "dependencies": {
+    "@tower/config": "workspace:*",
+    "@tower/logger": "workspace:*",
+    "@tower/types": "workspace:*",
+    "bullmq": "^5.0.0",
+    "ioredis": "^5.0.0"
+  },
+  "devDependencies": {
+    "@types/jest": "^29.0.0",
+    "@types/node": "^22.0.0",
+    "jest": "^29.0.0",
+    "ts-jest": "^29.0.0",
+    "ts-node": "^10.9.0",
+    "typescript": "^5.7.0"
+  }
+}

apps/worker/src/main.test.ts

@@ -0,0 +1,7 @@
+describe('worker bootstrap', () => {
+  it('exports a bootstrap function', async () => {
+    // Dynamic import so main.ts side-effects don't auto-run in tests
+    const mod = await import('./main');
+    expect(mod).toBeDefined();
+  });
+});

apps/worker/src/main.ts

@@ -0,0 +1,14 @@
+import { createLogger } from '@tower/logger';
+
+const logger = createLogger('tower-worker');
+
+async function bootstrap() {
+  logger.info('Tower worker starting...');
+  // Queue consumers will be registered here in later phases
+  logger.info('Tower worker ready');
+}
+
+bootstrap().catch((err) => {
+  console.error('Worker failed to start', err);
+  process.exit(1);
+});

apps/worker/tsconfig.json

@@ -0,0 +1,9 @@
+{
+  "extends": "../../tsconfig.base.json",
+  "compilerOptions": {
+    "outDir": "./dist",
+    "rootDir": "./src"
+  },
+  "include": ["src/**/*"],
+  "exclude": ["node_modules", "dist"]
+}