nx_measure_cost_test.nx

nx_measure_cost_test.nx -- the optimizer's cost model from MEASURED REALITY, not a datasheet. The Seed spores onto hardware and TIMES the actual operations (rdtsc cycle counter) to learn THIS machine's real costs -- so a slow/damaged/ asymmetric unit is reflected and the optimizer targets the hardware's true limits. (A board with a crippled divider measures div as expensive and the loop routes around it; a board with fast mul measures that and uses it.) Universal-reality invariant (true on every real CPU): integer DIV >> MUL >= ADD. We MEASURE it here -- the relative costs become the optimizer's cost table. Known answer (FAIL LOUD on the ordering, not exact cycles which vary): exit 0 iff measured div_cost > mul_cost AND mul_cost >= add_cost.