mir-backend-rust-axum

Make It Right (Axum module). Axum 0.8 + Tower + async Rust specific reliability augmentation. Use alongside mir-backend and mir-backend-rust when the target stack is Axum — it carries the mechanical footguns that the framework-agnostic tiers deliberately omit: the 0.8 route syntax change (/:id now panics, use /{id}), extractor ordering (body-consuming extractors must be last), custom extractors after the…