Jimmy

This will not affect existing contract, unless they compile it again.... so, not really a big deal, we can add a warning to the contract when they build it. But...

@shargon please review

✅ **Validated as FIXED** The Transfer example now builds successfully: ``` dotnet build examples/Example.SmartContract.Transfer/Example.SmartContract.Transfer.csproj → 0 Error(s) ```

✅ **Validated as FIXED** The NFT example now builds successfully: ``` dotnet build examples/Example.SmartContract.NFT/Example.SmartContract.NFT.csproj → 0 Error(s) ```

> How long will a checkpoint be maintained? > If checkpoints are saved permanently, there will be a large storage overhead for debugging purpose, will be there permanently, but its...

> That'd be DB-specific, but maybe somewhat more efficient in terms of speed. We do historic things via MPT (https://github.com/nspcc-dev/neo-go/blob/master/docs/rpc.md#historic-calls). MPT is way larger, but verifiable...

Rebased on the latest dev, resolved conflicts, and trimmed the branch so it now only exposes the policy/role governance APIs. Added native Policy setters/getters, RoleManagement.DesignateAsRole, TransactionAttribute wrappers, and refreshed the...