NBJSONRPC010: Annotate RPC proxy interfaces

Property	Value
ID	NBJSONRPC010
Category	Usage
Severity	Warning

Interfaces passed to JsonRpc.Attach or JsonRpcBatch.Attach must be annotated with JsonRpcContractAttribute or RpcMarshalableAttribute. The annotations enable contract validation and source-generated proxy discovery.

// NBJSONRPC010
rpc.Attach<IMyContract>();

Apply the appropriate annotation to the interface and resolve any resulting contract diagnostics.