- PostgresService: Find PostgreSQL from system paths or botserver-stack
- MinioService: Find MinIO from system paths or botserver-stack
- BotServerInstance: Pass --stack-path to create clean test stack
- Fix test_mock_services_available to only check enabled services
- Fix test_full_harness_has_all_services for current config
- Fix test_botserver_startup to skip if botserver not available
- All 41 e2e tests now pass