Structured logging convention: logger.info("namespace.action.complete", extra={...})

Directive (Burak Yigit Kaya, 2026-07-30): use the structured-logging pattern logger.info("user.action.complete", extra={"user_id": user.id, "action": "login", "ip_address": request.META.get("REMOTE_ADDR")}). Format: <entity>.<domain>.<verb> (e.g. user.login.complete, ingest.event.processed). Pass context as extra={...} so it can be indexed/queryable. Don't interpolate values into the message string — extra fields are what dashboards and search query.