- 3 tasks complete: structlog dependency, CorrelationIDMiddleware, Loki stack - D-01: JSON logging with correlation IDs; X-Correlation-ID header on responses - D-02: Loki+Promtail+Grafana in docker-compose; backend+celery-worker labelled - D-03: no OpenTelemetry added - 5 xfail stubs from 06-01 promoted to real assertions in test_logging.py