Attribute Macro hosted_rpc 

#[hosted_rpc]

HR1.1: trait-driven boilerplate eliminator for HostedRpcDep.

Apply to a user trait declaration to emit a <Trait>Stub worker-side struct that implements the trait by routing each call through a [test_r::core::HostedRpcChannel], plus a <Trait>Dispatch helper trait blanket-implemented for every T: Trait so the owner-side HostedRpcDep::dispatch impl can delegate to a generated method-table dispatcher instead of writing the per-method match arms by hand. See the rustdoc on the macro module for the precise wire format and the restrictions (no generics, no associated types, no async fns in the MVP).