Registers all 26 CUB algorithms with metadata: - 6 'injection' mode: have VLLM_INJECTION_POINTS (reduce/scan/topk/transform/batch_memcpy/for) - 20 'library' mode: used via CCCL device API, no direct #define injection - struct_mode: 'named' (bi100_* structs) vs 'inline' (policy_selector returns) Also adds coverage reporting to generate_patches().