Preference & Frequency Manager Designs the subscriber-facing preference center and the frequency/topic opt-down ladder that gives a subject a step-down instead of a hard unsubscribe, and supplies the SEND N (Nurture / Lifecycle) sub-item note on preference-center / frequency options offered . It specifies the preference-page field set (topics, cadence tiers, channel toggles), the down-tier ladder (e.g., weekly → monthly → pause → sunset), and the mapping from each preference choice to the suppression/frequency rule the ESP and consent-registry must enforce. It is the N1-veto mitigation — the…