Constant GATEWAY_API_API_VERSION 

pub const GATEWAY_API_API_VERSION: &'static str;

Canonical K8s Gateway API CRD apiVersion every gateway_routes- emitted Gateway / HTTPRoute document declares. Re-export of the canonical caixa_core::GATEWAY_API_API_VERSION so the Gateway-API-conformant CRD-group/version string lives in exactly one place across every caixa renderer — caixa-mesh’s gateway_routes Gateway + HTTPRoute emitters (the two production- code sites the prior inline literal sat at, caixa-mesh/src/lib.rs:455, 496) and every future per-edge TCPRoute / TLSRoute / GRPCRoute emitter the M3.x absorption- roadmap acknowledges now consult the same &'static str, so a future K8s Gateway API GA promotion (the upstream SIG-Network roadmap names per-CRD-group / per-version migration once the v1 GA branch matures) is a one-line edit on the canonical caixa_core::GATEWAY_API_API_VERSION declaration, not a coordinated rewrite across this crate’s two kube_resource_skeleton call sites + every future per-target renderer the substrate adds. The prior inline literals would have let a Gateway-API GA bump on one axis without a coordinated edit on the other silently emit a Gateway / HTTPRoute pair pointing at distinct CRD versions — apply-side: the Gateway and HTTPRoute land in two distinct apiserver-side CRD registrations, the per-route attached-policy resolution pipeline never binds, every external :entrada flow drops at the gateway with no field naming the version-drift root cause. Peer to the DEFAULT_NAMESPACE re-export on the sibling canonical-load-bearing-string axis — extends the discipline onto the canonical-K8s-Gateway-API-CRD-axis surface. Canonical K8s Gateway API CRD apiVersion every caixa-mesh-emitted Gateway / HTTPRoute document declares. The K8s apiserver-side SIG-Network Gateway API conformance registers the Gateway / HTTPRoute / GatewayClass / TCPRoute / TLSRoute / GRPCRoute CRDs at this exact group/version (gateway.networking.k8s.io/v1); drift to a stale v1beta1 / v1alpha2 (the pre-GA Gateway API betas every upstream conformance doc names) silently routes the rendered Gateway / HTTPRoute outside the apiserver’s CRD-version registration and breaks at apply time with a non-self-locating “no kind ‘Gateway’ is registered for version ‘gateway.networking.k8s.io/v1beta1’” error far from the source caixa.lisp / the renderer’s kube_resource_skeleton call site.

The single source of truth both Gateway-API CRD axes of the rendered Aplicacao mesh bundle reach for:

• Gateway apiVersion — the top-level CRD-group/version the rendered Gateway document declares (caixa-mesh/src/lib.rs:455 — the gateway_routes per-Aplicacao Gateway skeleton call);
• HTTPRoute apiVersion — the same Gateway API CRD group/version every per-:entrada :paths HTTPRoute declares (caixa-mesh/src/lib.rs:496 — the gateway_routes HTTPRoute skeleton call). The K8s SIG-Network Gateway API contract bumps Gateway, HTTPRoute, GatewayClass, and the rest of the per-conformance CRD set as a unit; a future Gateway-API GA promotion (the upstream Gateway API SIG roadmap names per-CRD- group / per-version migration once the v1 GA branch matures) on one axis without a coordinated edit on the other would have silently emitted a Gateway / HTTPRoute pair pointing at distinct CRD versions — apply-side: the Gateway and HTTPRoute land in two distinct apiserver-side CRD registrations, the per-route attached-policy resolution pipeline never binds, every external :entrada flow drops at the gateway with no field naming the version-drift root cause.

Until this lift landed both axes carried inline gateway.networking.k8s.io/v1 literals across two production-code occurrences in caixa-mesh/src/lib.rs:455, 496 (the gateway_routes Gateway + HTTPRoute skeleton calls) plus a matching pair inside the in-file gateway_carries_canonical_kube_skeleton_without_labels

• httproute_carries_canonical_kube_skeleton_without_labels test fixtures — four occurrences of the same load-bearing Gateway API CRD-group/version convention, drift-prone by construction.

The PRIME DIRECTIVE duplication-budget rule (THEORY.md §I.3.5, “every recurring shape becomes a generator before it becomes a pattern; every pattern becomes a library before it becomes duplicated code. The duplication budget is zero.”) promotes the constant to a typed substrate-side &'static str on the same trajectory the FLUX_HELMRELEASE_API_VERSION (55f0fd9) / FLUX_GITREPOSITORY_API_VERSION (8a6c8a3) / FLUX_KUSTOMIZATION_API_VERSION (d2dd1b1) / DEFAULT_FLUX_SYSTEM_NAMESPACE (7197d38) lifts established on the peer Flux-v2-controller-triplet canonical-load-bearing-string axis — extends the discipline from the cluster-side Flux v2 reconcile contract (the source/helm/kustomize controllers) onto the cluster-side K8s Gateway API ingress contract (the Gateway-API-conformant gateway implementation: Cilium, Istio, Envoy Gateway, NGINX, et al.). The two render-side consumers now thread the same &'static str through their kube_resource_skeleton calls so a future Gateway API CRD-group/version promotion lands in one place; every future renderer that reaches for the canonical Gateway API CRD apiVersion (the future M4 mesh.pleme.io/v1alpha1/Aplicacao CR materializer’s per-Aplicacao Gateway + HTTPRoute, a future per-edge TCPRoute / TLSRoute / GRPCRoute the caixa-mesh emits for non-HTTP :entrada edges, a future GatewayClass the operator emits for per-cluster gateway-class scoping) inherits the same value by construction with no opportunity for per-renderer drift.