Add agent dispatch intent contract

modules/work/domain/lease.go

@@ -39,3 +39,10 @@ func ValidateIndependentVerification(value work.IndependentVerification) error {
 	}
 	return nil
 }
+
+func ValidateDispatchIntent(value work.AgentDispatchIntent) error {
+	if value.DispatchID == "" || value.IdempotencyKey == "" || value.DelegationID == "" || value.RunID == "" || value.ImplementationID == "" || value.ImplementationRevision < 1 || value.SourceRevision == "" || value.WorktreeID == "" || value.VerificationPlanRef == "" || value.CreatedAtUnixMillis < 1 {
+		return ErrCallbackRejected
+	}
+	return nil
+}