Use ref-count based handling of NVSHMEM initialization state.#124
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Signed-off-by: Josh Romero <joshr@nvidia.com>
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…ngling references. Signed-off-by: Josh Romero <joshr@nvidia.com>
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This PR updates NVSHMEM runtime lifetime tracking to use a shared RAII token instead of explicit initialized/count fields.
Grid descriptors that use NVSHMEM now retain a reference to the initialized runtime and NVSHMEM is finalized when the last runtime reference is released. This mimics the existing NCCL communicator handling model introduced in #73.