nx_hackers_algo_compose_test.nx

nx_hackers_algo_compose_test.nx -- end-to-end composition of the ten hackers-algo primitives. Proves that the substrate primitives shipped 2026-05-20 compose without integration bugs. Scenario: serving two concurrent multi-modal requests against a shared backbone with GQA attention, multi-LoRA adapters, paged KV with prefix-sharing, continuous batching, speculative decoding, and a token-merge plan. All bits-up; zero Linux delegation. Substrate composition only -- no tensor kernels, no model weights -- the goal here is to verify primitive interaction, not to claim end-to-end inference correctness.