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6de8baef0b
Client-side [C1] of the agent broker (block/buzz#6790): lets the buzz CLI run without an agent nsec, routing reads and writes through a host so relay traffic looks like a normal Buzz client. - broker_client.rs: HttpBrokerClient implements the BrokerClient transport primitive the contract crate omits — POST /v1/action with an opaque bearer credential, parse an envelope regardless of HTTP status, never interpret a verdict. Correlation stays in execute(). - backend.rs: AgentBackend trait spoken in broker vocabulary, with two impls behind a Backend enum — BrokerBackend (keyless) and LocalBackend (nsec + relay, today's path). LocalBackend reuses the shared buzz_sdk::build_message builder, so there is no parallel message path. - lib.rs: register the two modules. Not yet wired into the command surface or provisioning. 8/8 unit tests pass (4 transport, 4 backend); clippy -D warnings clean. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Signed-off-by: Joel Robotham <jrobotham@squareup.com>