Function rdma_verbs_enabled 

pub const fn rdma_verbs_enabled() -> bool

2026-09-25: true when build.rs emitted metrale_rdma_verbs for this crate. The verbs shim is built by metrale-gpu-sys, and rustc-cfg does not cross crates, so build.rs re-emits the cfg from that crate’s links metadata. rdma_verbs_probe_tests checks it matches metrale_gpu_sys::verbs_enabled().