aw-client-rust ============== WIP: aw-client implementation in Rust `AwClient::wait_for_start()` is asynchronous: call `client.wait_for_start().await?` inside a Tokio runtime with networking and timers enabled. It waits for TCP connectivity, with a ten-second total deadline covering DNS resolution, connection attempts, and retry delays. It does not check HTTP readiness. `blocking::AwClient::wait_for_start()?` remains synchronous.