v0.2.0

Closes the structural gap with Axum + Tower + Hyper: router composition, first-class shared state, and a composable HTTP client that mirrors the middleware model outbound, including load balancing across endpoints.

Added

• Router composition: livery_router:nest/2,3 and merge/1,2.
• First-class service config shared by every handler/middleware, read with livery_req:config/1,2,3.
• Composable HTTP client (livery_client): timeout, retry, concurrency-limit, and circuit-breaker layers, streamed bodies both ways, and a livery_client_adapter behaviour (default livery_client_hackney, HTTP/1.1, HTTP/2, HTTP/3).
• Client load balancing (livery_client:balance/1): power-of-two-choices or round-robin selection, passive outlier ejection, lazy half-open recovery, static or livery_client_discover pools, runtime add_endpoint/2 / remove_endpoint/2.
• Bind to a specific listen address, including IPv6 (livery_inet), and reduced per-request overhead.
• Cowboy cutover validation suite.

Changed

• Wire dependencies on hex and bumped: quic 1.6.3, h2 0.8.0, webtransport 0.3.1, hackney 4.2.0, instrument 1.1.3.

Fixed

• H1 query string handling.
• Low-severity security hardening across the adapters.

Full changelog: https://github.com/benoitc/livery/blob/main/CHANGELOG.md