nx_cost_oracle.nx

nx_cost_oracle.nx -- compare declared counted costs, not elapsed-time performance. Retired instructions, switching events and bytes can be reproducible under a matched workload and measurement model. Their metric IDs alone do not establish reproducibility, workload equivalence, hardware portability, energy consumption or lower observed latency. This API has no timing/sampling contract and therefore continues to reject wall-clock inputs. A measured timing comparison belongs in an explicitly sampled contract. license_tier: ORIGINAL