Test: verify compose export produces valid YAML for each service

[GeiserX]

Context

CashPilot can export docker-compose.yml files for each service. The compose generation derives from YAML service definitions. We need to verify the output is valid.

Task

1. Add a test that generates compose YAML for each Docker-deployable service
2. Verify the output parses as valid YAML
3. Verify required keys exist: services, service name, image
4. Verify environment variables from the YAML definition appear in the output

Reference

• services/ — YAML service definitions
• app/orchestrator.py — compose generation logic