Adds README sections covering the three-phase domain rule evaluation order, the available match fields and operators, the keep-a-copy forwarding behaviour, the webhook retry/backoff model, the signing headers, and the new API surface, plus screenshots of both pages. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01PGeWDVSkXtVEmDAN2AtB9h