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* feat(server): add Prometheus metrics infrastructure and gRPC/HTTP request metrics Add metrics exposition via a dedicated server port (--metrics-port, default disabled) following the same optional-listener pattern as the health port. The metrics crate facade records counters and histograms in the MultiplexedService hot path, and a PrometheusHandle renders them at GET /metrics on the dedicated port. Metrics added: - openshell_server_grpc_requests_total (counter: method, code) - openshell_server_grpc_request_duration_seconds (histogram: method, code) - openshell_server_http_requests_total (counter: path, status) - openshell_server_http_request_duration_seconds (histogram: path, status) * feat(helm): add metrics port to openshell-server helm chart Expose the Prometheus metrics endpoint in the helm chart by adding service.metricsPort (default 9090) to values, the --metrics-port arg and container port to the statefulset, and a metrics service port. Set metricsPort to 0 to disable.