zk/circuit: Disable lead contract.

src/zk/circuit/mod.rs

@@ -4,5 +4,5 @@ pub use burn_contract::BurnContract;
 pub mod mint_contract;
 pub use mint_contract::MintContract;
 
-pub mod lead_contract;
-pub use lead_contract::LeadContract;
+// pub mod lead_contract;
+// pub use lead_contract::LeadContract;