nx_cost_oracle.nx

nx_cost_oracle.nx -- bits-up DETERMINISTIC measurement for fair performance head-to-heads (operator: "avoid the pitfalls of emulators and all the other stuff"). The emulator/timing pitfall: wall-clock and emulated cycle counts are NON-deterministic (vary by machine, emulator, cache, frequency scaling), so judging speed by time is BIASED -- the same two programs can flip winners across runs. The fix, from the hardware up: judge by a COUNTED INVARIANT that is identical every run -- retired instruction count, gate-toggle (switching) activity, or bytes moved. The cost oracle REFUSES to render a verdict on a non-deterministic metric. This is the performance arm of the Referee's DETERMINISM gate. license_tier: ORIGINAL Pairs with nx_referee (fair judging) + nx_gate_energy (toggles) + nx_uops_cost.