Email Notification Job Processor

Problem/Feature Description

A SaaS company needs a Node.js background job processor that consumes email notification jobs from a queue and sends them. The processor runs as a standalone process (not an HTTP server) in a Docker container on ECS.

The processor should:

1. On startup, connect to a simulated job queue (use an in-memory array pre-populated with sample jobs for demonstration).
2. Process jobs one at a time in a loop. Each job has: job_id, type (one of: "welcome", "password_reset", "invoice"), recipient_email, template_data, and priority (1-3).
3. Simulate sending the email (just a 100ms delay). Mark the job as "completed" or "failed" based on a simple rule: if recipient_email contains "invalid", mark as failed.
4. Track success/failure counts.
5. Shut down gracefully when receiving SIGTERM — finish the current job, then exit with a summary of processed/failed counts.

The processor needs to be operationally solid since it runs unattended in production with no human watching the output.

Output Specification

Produce:

• output/package.json with dependencies
• output/src/processor.ts — The main job processor
• output/src/types.ts — TypeScript interfaces for jobs
• Any additional files needed

Complete TypeScript code, no placeholders.