agent-platform release v4.119.1

The kagent controller GRPCRoutes match grpc.health.v1.Health (giantswarm/agent-platform#844). The kagent CLI pointed at the edge (--api-url https://agentgateway.<domain>:8443) checks reachability with the gRPC health service, which the controller registers; without a match the call fell into the MCP catch-all (mcp: client must accept both application/json and text/event-stream). Both routes, the data-plane kagent-controller and the edge kagent-controller-public, carry one service-only match for it next to kagent.controllerRoute.grpc.services; make verify-kagent-route asserts it on both.