close.onLeadMerged run when Close merges leads.
automations/on-close-lead-merged.automation.ts
account selects a named Close binding; the project binding is the default. Automate.ax creates and maintains the Close webhook and verifies each delivery with Close’s signing secret.
Returns a CloseEvent whose data is the resulting CloseLead. Inspect meta and previousData for provider merge details when available. All semantic events preserve the shared Close event envelope.