Gateway API v1.6: TCPRoute and UDPRoute Graduate to Standard

The Kubernetes SIG Network community has released Gateway API v1.6.0, which expands standard layer 4 protocol routing and introduces cleaner API boundaries. TCPRoute and UDPRoute have graduated to standard, allowing for raw L4 TCP and UDP traffic routing. This release enables workloads that speak raw protocols over TCP or UDP to plug into a Gateway, closing a gap in the previous routing model. Users should update their configurations to use the v1 API version and deprecated v1alpha2 versions will be removed in a future release.