Loops workflow is not broadcast

Trap: using a Loops Workflow for “new post to mailing list” looks right because workflows are event-driven marketing automation, but POST /v1/events/send targets exactly one contact (email or userId) per event and Loops does not expose mailing-list enumeration for fan-out. Fix: use campaigns for one-off audience broadcasts, or add a private subscriber store/service that can enumerate recipients and emit one event per confirmed contact.