mir-backend-rust

Make It Right (Rust runtime tier). Async Rust on Tokio runtime reliability footguns that are shared across EVERY Rust backend framework (Axum, Actix-web, Warp, Poem) — distinct from the generic backend gates and from any one framework's mechanics. Covers: blocking the async runtime (std::thread::sleep / blocking I/O inside async tasks starves Tokio worker threads), holding a std::sync::MutexGuard across an .await point (compile error or deadlock), cancellation safety (futures dropped at any .await under timeout/select!/disconnect leaving partial state), panic-poisoned Mutexes, Arc-based shared state with 'static bounds on spawned tasks, bounded vs unbounded channels for backpressure, and timeout discipline on every outbound call. TRIGGER when the backend runtime is Rust — sits between mir-backend (generic) and the framework module (e.g. mir-backend-rust-axum). SKIP for Python/Node/JVM/Go/.NET/Ruby/PHP/BEAM runtimes (each has its own mir-backend-<runtime> tier), and for framework-library mechanics (those live in the framework module).